UL 5 Flashcards
How many layers of muscles in the posterior compartments
- name the layers
-how many muscles ineach
-innervation
2
Superficial = 6, radial nerve
deep = 5, radial nerve
Discuss muscles of superficial layer of posterior compartments
-names
-insertion point
-function
There are six superficial muscles. From lateral to medial, they are:
- Brachioradialis
-inserts at distal radius
-function: weak flexor of the elbow joint - Extensor carpi radialis longus
-inserts 2nd metacarpal
-function: extension and abduction of wrist - Extensor carpi radialis
brevis
-inserts 3rd metacarpal
-function:extension and abduction of the wrist - Extensor digitorum
-insetion: extensor hood of digits
-function: extension of the wrist + MCP and IP joints of the digits - Extensor digiti minimi
-insertion: extensor hood of 5th digit
-function:extension of wrist and MCP + IP of the 5th digit - Extensor carpi ulnaris
-insertions: 5th metacarpal
-function:extension and adduction of the wrist
Discuss muscles of the deep layer
-name
-insertion
-function
*Supinator
- function:supinates the forearm and hand
-insertion: Lateral, posterior, and anterior surfaces of proximal third of radius
*Abductor pollicis longus
-insert: 1st metacarpal
-function: abducts the thumb
*Extensor pollicis brevis (EPB)
-insertion: proximal phalanx
-function: extension of the wrist + thumb and the CMC join
*Extensor pollicis longus
-insertion:distal phalanx
-functoin:extension of the wrist + thumb at IP, MCP, and CMC joints
*Extensor indicis (EI)
-insertion: dorsum of the index finge
-function: extension of index finger
The dorsal venous network drains into the _______ vein laterally and into the _____ vein medially.
cephalic
basilic
Describe the Anatomical Snuffbox
-what it is
-which structures are contained in it
-What structure lies on its floor
-triangular-shaped depression on the lateral aspect of the wrist, base of the thumb
-radial artery, the superficial branches of the radial nerve, and cephalic vein
-scaphoid bone
The posterior compartment is supplied by a branch of the ____ artery
ulnar
what are major superficial veins of the forearm
cephalic
basilic
The superficial branch of the ____ nerve innervates the skin over the lateral aspect of the dorsum of the hand, including the skin over the anatomical snuffbox and the skin over the dorsum of the lateral 3 1⁄2 digits, as far as the DIP joint.
radial
why are the articular surfaces of the shoulder are a poor fit
compromises the stability of the joint but increases range of movement.
function of tendon of the long head of biceps
sablilise humeral head in glenoid during powerful elbow flexion and forearm supination by the main muscle
which muscles protract scapula
-serratus anterior
-pectoralis major
-pectoralis minor
which muscles retract scapula
trapezius
rhomboid
latissimus dorsi
which muscles elevate scapula
-trapezius
-levator scapulae
-rhomboid muscles
which muscles depress scapula
latissimus dorsi
serratus anterior
pectoralis major
pectoralis minor
trapezius.
which muscles upwards rotate scapula
trapezius and serratus anterior
