33. How many different bones are involved in this joint?

Use the picture above to answer the following questions.

33. How many different bones are involved in this joint? (note the picture represents ONE structure with 2 views).

34. Which labeled items represent the dorsal aspect (back/posterior) of this joint?

35. Of the labeled items which is not on a/attached to a fossa?

36. Of the labeled items which anchor/attach on a fossa?

Expert Solution

Given pictures are showing shoulder joint.

33. Shoulder joint is made up of 3 bones- humerus, clavicle and scapula.

34. B,C and D represent the back aspect of shoulder joint. It can be identified by the spine of scapula which is present on posterior side.

35. Structure D which is teres minor muscle does not attach to any fossa. It originates from lateral border of scapula and inserts into the greater tuberosity of humerus.

36. Structure B (supraspinatus) and C (infraspinatus) originates from supraspinatus fossa and infraspinatus fossa respectively which is present in scapula.

Also structure A (subscapularis) originates form subscapularis fossa on scapula.

Structure D is teres minor, which does not insert into any fossa.

Sydney Mullin answered 2 years ago

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