What connects to the Infraspinous fossa?
It arises mostly from the infraspinous fossa of scapula, and connects it to the proximal humerus. Infraspinatus is one of the four rotator cuff muscles, alongside subscapularis, teres minor and supraspinatus muscles….Infraspinatus muscle.
| Origin | Infraspinous fossa of scapula |
|---|---|
| Blood supply | Suprascapular artery, circumflex scapular arteries |
What does the supraspinatus attach to?
Insertion. The supraspinatus tendon is inserted into the superior facet of the greater tubercle of the humerus.
What separates the Supraspinous and Infraspinous fossa?
A tubercle is a small rounded projection on a bone. Spine of the scapula – bony ridge that separates the supraspinous fossa from the infraspinous fossa.
Where does the infraspinatus attach?
humerus
| Infraspinatus muscle | |
|---|---|
| Origin | infraspinous fossa of the scapula |
| Insertion | middle facet of greater tubercle of the humerus |
| Artery | suprascapular and circumflex scapular arteries |
| Nerve | suprascapular nerve |
What is the infraspinous fossa of the scapula?
It is called the infraspinous fossa because it lies below (infra) the spine of the scapula (-spinous). Accordingly, the fossa that lies superior to the spine of the scapula is the supraspinous fossa. The infraspinatus muscle, one of the rotator cuff muscles, originates in the infraspinous fossa.
What muscle is attached to the subscapular fossa?
subscapularis muscle
The subscapularis muscle originates at the subscapular fossa and inserts into the lesser tubercle of the humerus. The muscle internally rotates and adducts the humerus.
What is the supraspinatus fossa?
Anatomical terms of bone The supraspinous fossa (supraspinatus fossa, supraspinatous fossa) of the posterior aspect of the scapula (the shoulder blade) is smaller than the infraspinous fossa, concave, smooth, and broader at its vertebral than at its humeral end. Its medial two-thirds give origin to the Supraspinatus.
What is the functional role of supraspinatus?
As part of the Rotator Cuff, supraspinatus helps to resist the gravitational forces which act on the shoulder joint to pull from the weight of the upper limb downward. It also helps to stabilize the shoulder joint by keeping the head of the humerus firmly pressed medially against the glenoid fossa of the scapula.
Which muscle attaches on the supraspinous fossa and the greater tubercle of the humerus?
supraspinatus
The supraspinatus (plural supraspinati) is a relatively small muscle of the upper back that runs from the supraspinous fossa superior portion of the scapula (shoulder blade) to the greater tubercle of the humerus. It is one of the four rotator cuff muscles and also abducts the arm at the shoulder.
What is the attachment of infraspinatus?
Insertion of the Infraspinatus Specifically, the infraspinatus inserts onto a large, round prominence located at the top, outer portion of the humerus. This prominence is called the greater tubercle or greater tuberosity. The infraspinatus muscle inserts onto the greater tubercle of the humerus.
What is the insertion of infraspinatus?
INSERTION. Middle facet of greater tuberosity of humerus and capsule of shoulder joint. ACTION. Laterally rotates arm and stabilizes shoulder joint.
Where does the supraspinous fossa attach to the spine?
The supraspinous fossa is bounded by the spine of scapula on the inferior side, acromion process on the lateral side and the superior angle of scapula on the superior side. Supraspinatus muscle originates from the supraspinous fossa. Distal attachment of the levator scapulae muscle is also on the medial aspect of the fossa.
What are the three attachments of the supraspinatus muscle?
Supraspinatus Muscle – Attachments, Actions & Innervation 1 Supraspinatus Muscle. Supraspinatus is a small muscle of the upper arm. 2 Attachments of Supraspinatus :Origin & Insertion. Supraspinous fossa of the scapula. 3 Actions of Supraspinatus: Helps the deltoid muscle initiate the abduction… 4 Innervation of Supraspinatus: Suprascapular nerve.
What causes hollowing in the supraspinatous fossa?
Hollowing in the supraspinatous and the infraspinatous area is frequently seen as chronic rotator cuff tear resulting in wasting. The wasting may be caused by the supraglenoid cyst compressing the suprascapular nerve and causes a loss of innervation to supraspinatus and infraspinatus muscles.
How is the supraspinatus exposed in the back?
Its medial two-thirds give origin to the Supraspinatus . The fossa can be exposed by the removal of skin and the superficial fascia of the back and the trapezius muscle .
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