NOTE: THIS QUESTION SOME CONFUSION. IN LAST'S ANATOMY BOOK (A PREVIOUS RECOMMENDED TEXT), THE NERVE SUPPLY OF THE AC JOINT IS THE SUPRACLAVICULAR NERVE. IN MOORE'S ANATOMY (THE NEW TEXT), THE NERVE SUPPLY OF THE AC JOINT IS THE LATERAL PECTORAL AND AXILLARY NERVE AND THE LATERAL SUPRACLAVICULAR NERVE (ACCORDING TO HILTON'S LAW) Arterial supply: suprascapular and thoracoacromial arteries Question 171 Regarding the interossei in the hand, which of the following is true? Your answer was correct A They arise from the tendons of Flexor digitorum superficialis B Palmar interossei have two heads C They abduct the fingers only D They are chiefly responsible for flexion of joints & extension of interphalangeal joints Correct Answer Explanation They from the metacarpal bones. Only dorsal interossei have two heads (bipennate). Interossei muscles abduct and adduct the fingers- Remember PAD and DAB - Palmar interossei ADduct and Doral interossei ABduct. The interossei are indispensable for the combined movement of flexion of the MCP joint and the simultaneous extension of the interphalangeal joints. The lumbricles extend both interphalangeal joints. Their action at the MCP joint is disputed and any flexor action here is likely to be weak
NOTE: THIS QUESTION SOME CONFUSION. IN LAST'S ANATOMY BOOK (A PREVIOUS RECOMMENDED TEXT), THE NERVE SUPPLY OF THE AC JOINT IS THE SUPRACLAVICULAR NERVE. IN MOORE'S ANATOMY (THE NEW TEXT), THE NERVE SUPPLY OF THE AC JOINT IS THE LATERAL PECTORAL AND AXILLARY NERVE AND THE LATERAL SUPRACLAVICULAR NERVE (ACCORDING TO HILTON'S LAW) Arterial supply: suprascapular and thoracoacromial arteries Question 171 Regarding the interossei in the hand, which of the following is true? Your answer was correct A They arise from the tendons of Flexor digitorum superficialis B Palmar interossei have two heads C They abduct the fingers only D They are chiefly responsible for flexion of joints & extension of interphalangeal joints Correct Answer Explanation They from the metacarpal bones. Only dorsal interossei have two heads (bipennate). Interossei muscles abduct and adduct the fingers- Remember PAD and DAB - Palmar interossei ADduct and Doral interossei ABduct. The interossei are indispensable for the combined movement of flexion of the MCP joint and the simultaneous extension of the interphalangeal joints. The lumbricles extend both interphalangeal joints. Their action at the MCP joint is disputed and any flexor action here is likely to be weak