Dissection 13: Hand and Wrist Flashcards
is the palmaris longus an intrinsic or extrinsic muscle of the hand?
extrinsic
what groups of wrist muscles are extrinsic in nature?
flexors
extensors
abductors
adductors
long flexors and extensors of what digits are extrinsic muscles?
all
are thumb adductors or abductors extrinsic in nature?
abductors
is the palmaris brevis intrinsic or extrinsic?
intrinsic
what does hypothenar mean?
regarding little finger
what does thenar mean?
regarding thumb
what do the interosseus muscles do?
abduction/adduction of fingers
what do the lumbricals do?
flexion of MCP joints
extension of PIP joints
name all the movements of the thumb
flexion extension abduction adduction opposition
where does lymph from the hands drain to?
cubital
axillary
what is another name for the antebrachial fascia?
deep fascia
at what 2 points does the deep fascia of the anterior forearm thicken?
palmar carpal ligament
flexor retinaculum
what does the flexor retinaculum attach to?
carpal bones
what does the flexor retinaculum prevent?
bowstringing of tendons during flexion
what is anterior to the carpal tunnel?
flexor retinaculum
what is posterior to the carpal tunnel?
carpal bones
what structures’ enter the palm via the carpal tunnel?
flexor digitorum superficialis
flexor digitorum profundus
flexor pollicis longus
what nerve enters the palm via the carpal tunnel?
median
why is sensation of the central palm spared in carpal tunnel?
palmar cutaneous branch of median nerve is given off proximal to the tunnel so escapes it
what forms the superficial palmar arch?
superficial palmar branches of ulnar and radial arteries
what forms the deep palmar arch?
deep palmar branches of ulnar and radial arteries
name the 4 neurovascular bundles that supply each finger
medial palmar
lateral palmar
medial dorsal
lateral dorsal
why is anaesthetic done around the finger?
to block all the nerves of the neurovascular bundles
what does the radial nerve supply on the hand?
skin over base ofthumb
name the only part of the palm that isnt covered by the median nerve and its innervation?
medial palm, ulnar
what nerve innervates the medial digits from half of the ring finger onwards?
ulnar
what nerve innervates the more lateral digits?
median
tenderness in floor of the anatomical snuff box?
scaphoid fracture
is the ulnar nerve’s sensory innervation the same as its motor?
yes
radial nerve sensory innervation of the hand?
anatomical snuff box
proximal index and middle finger
lateral part of hand
median nerve sensory innervation?
skin over distal thumb, index and middle finger
way to remember the functions of the interossei?
PAD DAB
palmar adducts
dorsal abducts
