Anatomy Origin: Anterolateral part of the superior surface of calcaneus and inferior extensor retinaculum. Insertion: Dorsal surface of the base of the proximal phalanx of the hallux (big toe). Key Relations: Merely the medial part of extensor digitorum brevis. Functions Extends the hallux at the interphalangeal joint (assists extensor hallucis longus). Supply Nerve supply: Deep

Anatomy Origin: Inferior aspect of lateral condyle of tibia, upper three-fourths of the anterior surface of the interosseous membrane and the anterior intermuscular septum. Insertion: The extensor digitorum longus tendon divides into four slips deep to the inferior extensor retinaculum. The four slips insert onto the dorsal aspects of the middle and distal phalanges of

Anatomy Origin: Anterolateral part of the superior surface of calcaneus and inferior extensor retinaculum. Insertion: Lateral aspect of the extensor digitorum longus tendons of 2nd, 3rd and 4th toes. Key relations: Runs anteromedially across the foot and can be palpated inferomedially to the lateral malleolus on the dorsum of the foot. Functions Extends the 2nd,

Anatomy Thick bands of connective tissue attaching from the bases of the two to five metacarpal bones. Functions By linking metacarpal bones two to five, they help to form the skeletal framework of the palm. Interested in taking our award-winning Pocket Anatomy app for a test drive?

Anatomy Layer of tough, dense, fibrous tissue that covers the upper portion of the cranium. Attaches posterior to occipitalis, anteriorly to frontalis, and laterally to auriculares anterior and superior. Posteriorly and laterally, its fibers are continued to the external occipital protuberance and zygomatic arch, respectively. Dorsally, it is firmly connected to the skin by the

Anatomy Origin: Bipennate muscles that arise by two heads from adjacent sides of posterior aspect of the metacarpals. Insertion: Extensor hood and base of proximal phalanges of the index, middle and ring fingers. (It is the middle digit that has two dorsal interossei inserting onto it.) Key relations: The radial artery (after passing between the

Anatomy The joint capsule attaches to the articular margins of the ulna, radius and humerus. It attaches to the margins of the olecranon, coronoid process and radial fossae. Distally, it blends with the annular ligament. The capsule is thinner anteriorly and posteriorly. Functions The capsule supplies static stability to the elbow joint. Interested in taking

Anatomy Origin: Sides of the adjacent metatarsals. Insertion: Bases of proximal phalanges of 2nd, 3rd and 4th toes and dorsal expansions of the extensor digitorum longus tendons. Key relations: The dorsal interossei lie dorsal to the plantar interossei and together they form the fourth layer of the plantar muscles of the foot. Also, see view

Anatomy Course On the dorsum of the foot they receive the intercapitular veins. They travel briefly to join the plantar cutaneous venous arch. Drain Drains the dorsal surface of the digits of the foot. Interested in taking our award-winning Pocket Anatomy app for a test drive?

Motion The elbow joint is a uniaxial compound synovial hinge joint. The elbow joint actually includes 2 joints the humeroulnar joint and the humeroradial joint. The capitulum of the humerus articulates with the head of the radius, and the trochlea of the humerus articulates with the trochlear notch of the ulna. Together these articulations make