Flashcards in Lecture 16- Arm and Shoulder Deck (13):
Intermuscular septum divides arm into anterior (.......) &
posterior (........) compartments.
• Long bone
• Proximal head articulates with ......... ........ of scapula
• Distal medial and lateral epicondyles articulate at elbow with ulna and radius
• Surgical neck common fracture site which can endanger which nerve?
Anterior compartment of arm
• Muscles are primarily flexors of forearm at elbow
• Secondarily flexors of arm at shoulder (biceps brachii &
• Innervated by ................ nerve
• Blood supply by .......... artery
• Primarily extensors of the forearm at elbow.
• Blood supply from deep artery of arm (profunda brachii).
• Innervated by radial nerve.
Blood supply of the upper limb
Aorta ->Brachiocephalic trunk ->Subclavian artery ->Axillary artery ->Brachial artery-> Radial artery->Ulnar artery
Blood supply of the arm Brachial artery supplies anterior arm muscles
Deep brachial artery (profunda brachii) supplies posterior arm
Innervation of arm muscles
Musculocutaneous nerve (lateral cord of brachial plexus)
Biceps brachii -> Brachialis ->Coracobrachialis
(posterior cord of brachial plexus) ->Triceps brachii ->Anconeus
Superior appendicular skeleton
Bones of arm & shoulder comprised of:
• Pectoral girdle =
• Cylindrical bone.
• Slight “s” curve
• Formed by intra-membranous ossification (1st long bone to ossify).
• Most commonly fractured bone.
• Acts as a strut to keep limb away from trunk
• Flat triangular bone.
• Shallow glenoid cavity.
• Attachment location for 17 muscles.
• Uncommon to fracture.
Joints of the pectoral girdle
• Acromioclavicular joint
• Glenohumeral joint
• Sternoclavicular joint
• Synovial plane joint.
• Allows gliding movement as arm is raised and scapula rotates.
- Acromioclavicular joint capsule & ligament
- Coracoclavicular (conoid and trapezoid ligaments)