Anatomy One of the intrinsic muscles of the back. Consists of longissimus capitis, cervicus and thoracis. Longissimus capitis: Origin: Transverse process of T1 to T5 and articular processes of C5 to C7 approx. Insertion: Posterior margin of mastoid process. Key Relations: Lies medial to longissimus cervicus. Longissimus cervicis: Origin: Transverse processes of T1 to T5.

Anatomy Origin: Middle half of the anteromedial surface of the fibula and the interosseous membrane. Insertion: Dorsal surface of the base of the distal phalanx of the hallux (big toe). Key Relations: -One of the four muscles of the anterior compartment of the leg. -The extensor hallucis longus tendon crosses anterior to the ankle joint

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 Origin: Lateral epicondyle of humerus via the common extensor tendon and adjacent intermuscular septum. Insertion: Through separate tendons inserting into extensor hoods on dorsal surface of middle and distal phalanges of the four fingers. Key Relations: One of the two muscles in the intermediate posterior compartment of the forearm. Functions -Extension of four fingers

Anatomy Course Arises after the bifurcation of the common carotid artery at the level of the thyroid. As it rises it takes a curved path and rapidly diminishes in size due to the amount of collaterals it gives off. It eventually ends up behind the neck of the mandible where it gives off its terminal

Anatomy Origin: Lateral epicondyle of humerus via the common extensor tendon, adjacent intermuscular septum. Insertion: Dorsal hood of the little finger. Key Relations: One of the two muscles in the intermediate posterior compartment of the forearm. Functions -Extends the little finger at the metacarpophalangeal joint. -Extends the interphalangeal joints of the little finger. -Helps extend

Anatomy Origin: First head: Lateral epicondyle of humerus via the common extensor tendon. Second head: Posterior border of ulna. Insertion: Medial aspect of base of fifth metacarpal Key Relations: One of the four muscles in the superficial posterior compartment of the forearm. Functions -Extends the hand at the wrist joint. -Adducts the hand at the

Anatomy Origin: Distal third of lateral supracondylar ridge of humerus and lateral intermuscular septum. Insertion: Posterior aspect of base of second metacarpal. Key Relations: One of the four muscles in the superficial posterior compartment of the forearm. Functions -Extends the hand at the wrist joint. -Abducts the hand at the wrist (radial deviation) particularly when