Humerus Flashcards
What are the 2 prominent landmarks on the proximal end of the humerus?
The greater and lesser tubercle.
What are the 3 tendon attachments for the greater tubercle?
Superior - supraspinatus
Middle - infraspinatus
Inferior - teres minor
What is the position of the greater tubercle when compared with the lesser tubercle?
The greater tubercle is lateral while the lesser tubercle is more medial and anterior.
What muscle attaches to the lesser tubercle?
The subscapularis muscle.
What separates the greater and lesser tubercle and what structure passes through it?
The intertubercular sulcus (bicipital groove) which allows the biceps brachii (long head) to pass through.
How can you further divide the intertubular sulcus?
The lateral lip, floor, and medial lip.
Pectoralis major, latissimus dorsi, and teres major respectively.
What is the lateral lip continuous with?
this structure is attached by a muscle.
The deltoid tuberosity for the attachment of the deltoid muscle.
What is on the opposite of the deltoid tuberosity (on the medial side)?
The facet for coracobrachialis attachment.
Where does the posterior circumflex humeral artery and the axillary nerve pass through in this area?
It passes immediately posterior to the surgical neck of the humerus.
Why is it called the surgical neck?
Because it is so prone to fracture.
Although rare, but the axillary nerve may be broken in humeral fractures, what muscles would be affected in this process?
Deltoid.
