Shoulder Joint, Posterior Arm & Posterior Forearm Flashcards
What nerve supplies the deltoid muscle?
Axillary
What are the attachments of the deltoid?
Proximally = Lateral 1/3 of the clavicle and inferior aspects of spine and acromion Distally = Deltoid tuberosity of humerus
What strengthens the fibrous capsule of the shoulder joint?
Superiorly = Supraspinatus tendon Posteriorly = Infraspinatus and teres minor tendons
Where is the subacromial bursa located?
Between supraspinatus tendon and accordion process of scapula
What is the sensory innervation to the posterior arm?
Medially = Anterior rami of C8, T1 and T2 Laterally = Anterior rami of C5 and C6
What is the only muscle of the posterior compartment of the arm?
Triceps Brachii
What is the innervation of triceps brachii?
Radial nerve
What are the attachments of triceps brachii?
Proximal = Infragelnoid tubercle of scapula (long head), superior (lateral head) and inferior (medial head) to the radial groove of the humerus Distal = Triceps tendon attached to olecranon process of ulna
What is the action of triceps brachii?
Weak extension of the arm at the shoulder
Extension of the forearm at the elbow
What muscles are supplied by the axillary nerve?
Deltoid
Teres minor
Which spinal nerves form the axillary nerve?
C5-6
Where is the axillary nerve found?
Quadrangular space Teres minor superiorly Theres major inferiorly Long head of triceps medially humerus laterally
What is the area of skin innervated by the axillary nerve called?
Badge patch
Which spinal nerves form the radial nerve?
C5-T1
With which kind of fracture is the radial nerve at particular risk?
(Spiral) mid shaft fracture of the humerus
