Human Anatomy Essentials: 300 Structures and Landmarks

Map 300 essential structures by location, relationship and function.

300 cardsLast updated 2026-08-16

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Anatomy sticks when a structure is tied to where it is, what borders or passes through it, and why that matters. These 300 cards cover anatomical language, the skeleton, joints, major muscles, neuroanatomy, thorax, abdomen, pelvis, head and neck, selected vessels and the major organs — a regional survey built around the structures a first course actually asks you to place. Each independently written answer pairs a concise identification with a spatial or functional anchor. Import it and the whole deck joins your spaced-repetition schedule. Structures you already know stretch out and drop out of sight; the ones that keep slipping come back until they stop slipping. What goes down is the number of structures you still don't know — not the time it takes to flip past 300 cards you mostly do.

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Showing 100 representative cards from the full 300-card deck.

Front	Back
Axial skeleton	The part of the skeleton made up of the skull, vertebral column, ribs, and sternum. It forms the body’s central support and protects the brain, spinal cord, and thoracic organs.
Diaphysis of a long bone	The shaft or central tubular portion of a long bone. It is built mainly for strength and weight bearing, with a hollow medullary cavity in adults.
Metaphysis	The flared region between the diaphysis and epiphysis of a long bone. In growing bones, it contains the epiphyseal plate region.
Articular cartilage	Smooth hyaline cartilage that covers the joint surfaces of bones. It reduces friction and helps absorb compressive force in synovial joints.
Clavicle	The collarbone; a curved bone between the sternum and scapula. It braces the shoulder and helps keep the upper limb away from the thorax.
Radius	The lateral forearm bone in anatomical position, on the thumb side. It participates strongly in wrist motion and crosses over the ulna during pronation.
Metacarpals	The five bones forming the palm of the hand. They connect the carpal bones to the phalanges and support grip and hand shape.
Femur	The thigh bone and the longest bone in the body. It extends from the hip to the knee and bears major weight during standing and walking.
Tibia	The larger, medial bone of the leg between knee and ankle. It is the main weight-bearing bone of the lower leg.
Metatarsals	The five long bones of the midfoot that connect the tarsals to the toe phalanges. They help form the arches and support propulsion.
Vertebral column	The spine, a column of vertebrae extending from skull base to pelvis. It supports the trunk, protects the spinal cord, and allows flexibility.
Intervertebral disc	A fibrocartilaginous pad between adjacent vertebral bodies. It absorbs shock and permits limited movement between vertebrae.
Cartilaginous joint	A joint where bones are connected by cartilage, allowing limited movement. Examples include the pubic symphysis and intervertebral discs.
Saddle joint	A synovial joint with reciprocally concave and convex surfaces. It allows biaxial movement; the thumb carpometacarpal joint is the key example.
Glenohumeral joint	The main shoulder joint between the head of the humerus and the glenoid cavity of the scapula. It is highly mobile but less inherently stable.
Deltoid	The large triangular muscle covering the shoulder. It abducts the arm and also assists with flexion and extension depending on the fiber group.
Supraspinatus	A rotator cuff muscle on the superior posterior scapula. It initiates arm abduction and helps stabilize the shoulder.
Biceps brachii	An anterior arm muscle with two heads. It flexes the elbow and is a strong supinator of the forearm.
Brachialis	A deep anterior arm muscle beneath the biceps brachii. It is a primary flexor of the elbow.
Pronator teres	An anterior forearm muscle that turns the palm downward. It also helps flex the elbow.
Elbow joint	The compound joint between humerus, ulna, and radius. It primarily allows flexion and extension, with forearm rotation occurring near it as well.
Carpometacarpal joint of the thumb	The saddle joint between the trapezium and first metacarpal. It allows opposition, a key movement for precision grip.
Greater trochanter	A large lateral projection on the proximal femur. It is a major attachment site for hip muscles and can be felt on the outside of the upper thigh.
Iliopsoas	A deep hip flexor made up of the iliacus and psoas major. It is the main muscle group for flexing the hip.
Quadriceps femoris	The major anterior thigh muscle group, including rectus femoris and the three vasti. It is the primary extensor of the knee.
Sartorius	A long superficial muscle running obliquely across the thigh. It assists in hip flexion, abduction, and lateral rotation, and also helps flex the knee.
Tibial tuberosity	A rough anterior prominence on the proximal tibia. It is the attachment site for the patellar tendon.
Achilles tendon	The large tendon joining the calf muscles to the calcaneus. It transmits force for plantar flexion.
Talus	A tarsal bone that sits above the calcaneus and receives the tibia and fibula at the ankle. It transmits body weight into the foot.
Lateral malleolus	The bony prominence on the outer ankle formed by the distal fibula. It helps stabilize the ankle laterally.
Tibialis anterior	A muscle on the front of the leg that dorsiflexes and inverts the foot. It is important for controlling foot placement during gait.
Anatomical position	The standard reference posture: standing upright, facing forward, arms at the sides, palms facing forward, and feet pointing forward.
Lateral	Farther from the midline. In anatomical position, the thumb lies lateral to the little finger.
Distal	Farther from the trunk or point of attachment. The fingers are distal to the wrist.
Posterior	Toward the back of the body. The scapula lies posterior to the ribs.
Inferior	Toward the feet or lower part of the body. The pelvis is inferior to the abdomen.
Supination of the forearm	Rotation that turns the palm anteriorly or upward in anatomical position. It places the radius and ulna parallel.
Extension at a joint	A straightening movement that increases the angle between bones, such as straightening the elbow or knee.
Adduction	Movement toward the body’s midline. At the shoulder or hip, it means bringing the limb back toward the trunk.
Trachea	Midline airway tube extending from the larynx to the main bronchi; supported by C-shaped cartilaginous rings and conducts air to the lungs.
Left main bronchus	Air passage from trachea to left lung; longer, narrower, and more horizontal because it passes under the aortic arch toward the left hilum.
Parietal pleura	Outer pleural layer lining the thoracic wall, diaphragm, and mediastinum; forms the pleural cavity with a thin fluid film.
Pericardium	Fibrous and serous sac surrounding the heart and the roots of the great vessels; anchors the heart and limits acute overexpansion.
Myocardium	Thick muscular middle layer of the heart wall responsible for contraction and pumping blood.
Right ventricle	Lower right heart chamber that pumps blood into the pulmonary trunk toward the lungs.
Left ventricle	Thick-walled chamber that ejects blood into the aorta for systemic circulation; forms the apex of the heart.
Aortic valve	Semilunar valve between the left ventricle and ascending aorta; prevents backflow into the ventricle during diastole.
Tricuspid valve	Right atrioventricular valve between right atrium and right ventricle; has three cusps and is supported by chordae tendineae.
Papillary muscles	Conical ventricular muscles that tense the chordae tendineae and stabilize the AV valves during systole.
Posterior interventricular sulcus	External groove on the diaphragmatic surface between the ventricles; typically contains the posterior interventricular artery and the middle cardiac vein.
Pulmonary trunk	Large vessel leaving the right ventricle before dividing into right and left pulmonary arteries; carries deoxygenated blood to the lungs.
Left coronary artery	Short arterial trunk from the left aortic sinus that usually divides into the anterior interventricular (LAD) and circumflex arteries, supplying most of the left atrium, left ventricle, and much of the interventricular septum.
Azygos vein	Vein running along the right side of the vertebral column in the thorax; drains posterior thoracic wall and empties into the superior vena cava.
Oblique fissure of the lung	Major fissure present in both lungs; it separates the inferior lobe from the superior lobe on the left and from the superior and middle lobes on the right.
Alveoli	Microscopic air sacs where gas exchange occurs across the alveolar-capillary membrane.
Esophagus	Muscular tube carrying food from pharynx to stomach; passes posterior to the trachea through the thorax and diaphragm.
Fundus of the stomach	Superior dome-shaped part of the stomach, typically to the left of the esophageal entry.
Duodenum	First part of the small intestine, C-shaped around the pancreatic head; receives bile and pancreatic secretions.
Ileocecal valve	Junction between ileum and cecum that helps limit backflow from the large intestine into the small intestine.
Transverse colon	Intraperitoneal segment of colon extending from the hepatic flexure to the splenic flexure, crossing the abdomen from right to left anterior to much of the small intestine and inferior to the liver and stomach.
Rectum	Terminal part of the large intestine between the sigmoid colon and anal canal; it follows the curvature of the sacrum and serves as a temporary reservoir for feces.
Common bile duct	Main duct carrying bile toward the duodenum after joining the common hepatic and cystic ducts.
Superior mesenteric artery	Major abdominal artery supplying midgut structures including much of the small intestine and proximal large intestine.
Kidney	Paired retroperitoneal organ that filters blood, regulates fluid and electrolytes, and produces urine.
Urinary bladder	Expandable muscular reservoir in the pelvis that stores urine before voiding.
Urethra	Terminal urinary passage from bladder to exterior; length and course differ markedly between sexes.
Ovary	Paired female gonads typically located on the lateral wall of the true pelvis; they produce oocytes and secrete estrogen and progesterone.
Uterus	Muscular hollow organ in the female pelvis where implantation and fetal development occur; situated between bladder and rectum.
Cervix of the uterus	Lower narrow uterine segment that projects into the vagina and forms the cervical canal.
Labia minora	Inner non-hair-bearing folds of the vulva that bound the vestibule; the urethral and vaginal openings lie within the vestibule.
Temporal bone	Lateral skull bone that houses the structures of hearing and balance and includes the mastoid and styloid processes.
Ethmoid bone	Light cranial bone between the orbits that contributes to the nasal septum, roof of the nasal cavity, and medial orbit.
Zygomatic bone	The cheekbone; it forms the prominence of the face and contributes to the lateral wall and floor of the orbit.
Palatine bone	Paired bones that contribute to the posterior hard palate, part of the nasal cavity, and a small portion of the orbit.
Pterygopalatine fossa	Small deep facial space behind the maxilla that communicates with the orbit, nasal cavity, palate, and infratemporal region.
Mastoid process	Conical projection of the temporal bone behind the ear; it serves as an attachment site for neck muscles.
Coronal suture	Fibrous joint between the frontal bone and the parietal bones; it runs across the top of the skull.
Squamous suture	Curved suture joining the temporal bone and parietal bone on the lateral skull.
Middle cranial fossa	Central skull base depression containing the temporal lobes and the pituitary region.
Optic canal	Opening in the sphenoid bone that transmits the optic nerve and ophthalmic artery to the orbit.
Foramen spinosum	Small sphenoid opening posterior to foramen ovale that transmits the middle meningeal vessels.
Nasal septum	Midline partition that divides the nasal cavity into right and left passages; it includes bone and cartilage components.
Palatine tonsil	Lymphoid tissue in the lateral wall of the oropharynx between the palatal arches; it helps defend against inhaled and ingested pathogens.
Larynx	Cartilaginous airway between pharynx and trachea that protects the lower airway and houses the vocal folds.
Carotid sheath	Fascial compartment in the neck that encloses the common carotid artery below the carotid bifurcation, the internal carotid artery above it, the internal jugular vein, and the vagus nerve.
Hyoid bone	U-shaped bone in the anterior neck that does not articulate with other bones; it anchors tongue and laryngeal muscles.
Cervical vertebrae	Seven vertebrae forming the neck portion of the spine; they support the head and allow substantial neck motion.
Cervical spinal enlargement	Widened spinal cord region containing increased neurons for upper-limb innervation; its segments contribute to the brachial plexus.
Filum terminale	Thin fibrous extension of pia mater from the conus medullaris that helps anchor the spinal cord inferiorly.
Ventral root	Anterior spinal nerve root carrying motor output away from the spinal cord.
Posterior horn	Dorsal gray-matter region that receives and processes incoming sensory signals.
Cerebrum	Largest part of the brain, responsible for conscious thought, voluntary movement, language, and higher sensory processing.
Parietal lobe	Lobe behind the central sulcus that integrates touch, body position, and spatial awareness.
Insula	Deep cortical region hidden within the lateral sulcus; it contributes to taste, visceral sensation, and integration of internal state.
Hypothalamus	Control center below the thalamus that links the nervous and endocrine systems and regulates homeostasis.
Midbrain	Upper brainstem region involved in visual and auditory reflexes and motor pathway relay.
Cerebellum	Posterior hindbrain structure that coordinates movement, balance, posture, and motor learning.
Dura mater	Tough outer meningeal layer; cranial dura is adherent to the inner skull, and spinal dura forms the outer dural sac around the spinal cord.
Lateral ventricle	Paired CSF-filled cavity within each cerebral hemisphere that communicates with the third ventricle.
Coronoid process of the ulna	The anterior projection on the proximal ulna that forms part of the elbow joint and fits into the coronoid fossa of the humerus during flexion.

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Yes. It covers core regional and systems anatomy, including major bones, muscles, organs, vessels, peripheral nerves and central nervous system landmarks.

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Editorial method and sources

Memly's editors use the primary sources below to check scope and terminology, then independently write and review the cards.

MedlinePlus: Anatomy