Anatomy Exam 3
Which movements are possible at the MCP joints of the fingers?
flexion, extension, abduction, adduction
where does flexor carpi radialis insert?
2nd and 3rd metacarpals
what makes up dorsal compartment 1?
Abductor Pollicis Longus & Extensor Pollicis Brevis
Which two muscle tendons comprise the first dorsal compartment?
Abductor Pollicis Longus, Extensor Pollicis Brevis
Which muscle tendons make up the anterior border of the anatomical snuff box?
Abductor pollicis longus Extensor pollicis brevis
What nerve innervates the deep layer of the muscles of the flexor compartment of the forearm?
Anterior Interosseous Nerve
What syndrome is associated with tendons of the first dorsal compartment?
DeQuervain's syndrome
The radiocarpal joint performs the following movements:
Flexion, extension, abduction (radial deviation) and adduction (ulnar deviation)
The anterior interosseous nerve innervates all of the following:
Flexor Digitorum Profundus, Flexor Pollicis Longus, Pronator Quadratus
The anterior interosseous nerve is derived from the ______nerve, and innervates the _________,_________, and _______ muscles.
Median, flexor digitorum profundus, flexor pollicis longus, pronator quadratus
The flexor digitorum superficialis sends four tendons that cross the wrist to help with flexion of the ____ and ____ joints of the digits.
PIP; MCP
List symptoms of carpal tunnel syndrome:
Pain, tingling, and numbness of the index, middle, and radial half of ring finger, thenar muscle weakness
Which bones articulate to form the radiocarpal joint?
Radius & Carpal Bones (scaphoid, lunate, triquetrum)
Clinically, if you have an infection that develops in the synovial tendon sheaths of certain digits of the hand, the infection can travel and produce itself in the wrist. Due to the discontinuation of the __________ in digit(s) _______ , infection remains contained distally in these digits UNLESS there's a rupture in the synovial sheath.
Ulnar bursa, 2-4
Which ligaments limit extension at the IP joints of the digits?
Volar ligaments/plates
Thenar muscles receive some or all innervation from the recurrent branch of the median nerve except for:
adductor pollicis
Your patient sustained an injury to the median nerve. Which of the following thenar muscles will not be impacted by the injury?
adductor pollicis (deep branch of ulnar nerve)
Which of the following muscles contribute to the extensor expansion of the digits? A. Lumbricals B. Palmar interossei C. Dorsal Interossei D. All of the above
d
Which of the following nerves supply the majority of the cutaneous innervation to the posterior aspect of the forearm? A. Posterior cutaneous nerve of forearm B. Medial cutaneous nerve of forearm C. Superficial branch of Radial Nerve D. Both A and B
d
The anterior interosseous nerve innervates all of the following, EXCEPT: A. Flexor Digitorum Profundus B. Flexor Pollicis Longus C. Pronator Quadratus D. Flexor Digitorum Superficialis
d) flexor digitorum superficialis (median nerve)
Which of the following muscles of the deep layer of the posterior compartment of the forearm is NOT innervated by the posterior interosseous nerve? A. abductor pollicis longus B. extensor pollicis brevis C. extensor indicis D. supinator
d) supinator
What makes up the 2nd dorsal compartment? Where do these tendons insert?
extensor carpi radialis longus (posterior aspect of base of 2nd metacarpal) extensor carpi radialis brevis (base of 3rd metacarpal)
what makes up dorsal compartment 2?
extensor carpi radialis longus/brevis
what makes up dorsal compartment 6?
extensor carpi ulnaris
what makes up dorsal compartment 5?
extensor digiti minimi tendon
what makes up dorsal compartment 4?
extensor digitorum tendons (4) & extensor indicis tendon
what makes up dorsal compartment 3?
extensor pollicis longus
The only muscle located in the superficial layer of the anterior portion of the forearm that is innervated by the ulnar nerve is the _____.
flexor carpi ulnaris
What are extrinsic hand muscles responsible for?
power grip, gross motor strength
What are intrinsic hand muscles responsible for?
precision grip, fine motor movements
Which ligament prevents excessive ulnar deviation at the radiocarpal joint?
radial collateral ligament
what are the dorsal compartments?
synovial sheaths containing groups of tendons. they reduce friction during gliding
What structures pass through Guyon's Canal?
ulnar artery and ulnar nerve
