Anatomy Origin: Posterior of distal radius and adjacent Interosseus membrane. Insertion: Dorsal surface of base of proximal phalanx of thumb. Key Relations: -Its tendon together with the tendon of abductor pollicis longus forms the anterior boundary of the anatomical snuff box. -One of the six muscles in the deep posterior compartment of the forearm. Functions

Anatomy Origin: Posterolateral aspect of middle third of ulna and adjacent interosseous membrane. Insertion: Dorsal surface of base of the distal phalanx of thumb. Key Relations: -The tendon of extensor pollicis longus passes underneath the extensor retinaculum in its own compartment. -Its tendon forms the posterior boundary of the anatomical snuffbox. -One of the six

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

Functions The main function of the pinna is to collect sound and direct it into the ear canal; it acts as a filter, in that it selects the sound waves that are with the frequency range of human hearing. Anatomy Also known as the external ear, the pinna is the visible portion of the ear

Motion The distal tibiofibular joint is a syndemosis type fibrous joint. The medial surface of the inferior end of the fibula articulates with the fibular notch on the lateral side of the tibia. It allows very little movement but slight movement accommodates the talus during dorsiflexion of the foot. Stability Ligaments stabilizing the joint include:

Anatomy A thin but broad fibrous bundle, which passes between the adjacent surfaces of the calcaneus and cuboid, on the dorsal surface of the joint. Functions Provides support to the subtalar joint between the calcaneus and cuboid. Interested in taking our award-winning Pocket Anatomy app for a test drive?

Anatomy Strongest and most distinct carpometacarpal ligaments connecting the carpal and metacarpal bones on their dorsal surface of the hand. The second metacarpal bone receives two fibrous bands from the trapezoid and trapezium bone. The third metacarpal receives two bands, one each from the trapezium and capitate bones. The fourth two, one each from the

Anatomy Attaches from the dorsal margin of the cuboid bone to the lateral dorsal margin of the lateral cuneiform bone of the foot. Functions One of the dorsal ligaments of the foot. It stabilizes the dorsal surface of the foot. Interested in taking our award-winning Pocket Anatomy app for a test drive?

Anatomy Course Branches of the dorsal metacarpal arteries. They enter the distal portions of the digits on the posterior surface of the phalanges. Anastamoses exist between them and the proper palmar digital arteries. The arteries are dorsal to the digital nerves. Supply Supply the lateral, medial and dorsal aspects of the digits. Interested in taking

Anatomy Course Branches of the superficial radial nerve near its termination. Supply Lateral aspect of the middle finger as well as the medial aspect of the index finger. Interested in taking our award-winning Pocket Anatomy app for a test drive?