Upper limb session 2 Flashcards
What is Supination and pronation
Supination is palms up
Pronation palms down
What lies in the radial groove
deep brachial artery and radial nerve
How does the radius attach to the humerus
weak articulation with the capitulum of humerus
How does the radius articulate with the ulna
into the radial notch
2 processes on the ulna?
coronoid - at front fits into coronoid fossa
Olecranon - at the back in the trochlea notch of the humerus (main boney bit of elbow)
Annular ligament? Importance in children?
from radial notch of ulna wraps around radius to ensure it does not slip out. In children due to different shape of radius head the ligament can slip and dislocate joint
Blood supply to the arm up until the cubital fossa
subclavian artery straight from the aorta (left side) or brachiocephalic (on the right side) becomes the axillary artery at 1st rib, then branches. When reaches lower border of the trees major it becomes the brachial artery
what are the 5 terminal branches of the plexus of nerves supplying the arm
from C5-T1 : axillary, muscolocutaneous, radial,median, ulna
what does the musculocutaneous nerve inervate
flexor muscles - bicep brachii, brachialis, corocobrachialis.
Bicep origin and insert and action
long - origin in glenohumeral joint
Short - Corocoid process origin
both converge on the bicep tendon in cubital fossa
Action is flexion of elbow and weak flexion of the shoulder
Corocobrachialis origin, insert, action
Origin - corocoid process
Insert- mid shaft of the humerus
Action - shoulder flexion
Brachialis origin, insert, action
origin - mid shaft of the humerus
Insert - into ulna
Action flexion of elbow - strongest flexor
Tricep origin, insert, action and what is it inervated by and blood supply
origin - has three heads - infraglenoid tubercle (long head) the most medial part of triceps, lateral head is posterior part of the upper third of humerus, medial head is deeper than other two
blood supply - profundi brachii
Insert - tendon that inserts into the elecromon of ulna
Action - extension of elbow and shoulder
Innervated by he radial nerve
What nerve innervates the deltoid
axillary nerve which goes between the trees major and minor. also innervates the lateral upper arm skin
How do you expose the axially artery in surgery
disect pectoralis minor underneath the clavicle
