What is the origin of subscapularis?
Table of Contents
What is the origin of subscapularis?
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 origin insertion and action of subscapularis?
Subscapularis muscle
| Origin | Subscapular fossa of scapula |
|---|---|
| Insertion | Lesser tubercle of humerus |
| Action | Shoulder joint: Arm internal rotation Stabilizes humeral head in glenoid cavity |
| Innervation | Upper and lower subscapular nerves (C5 – C6) |
| Blood supply | Suprascapular artery, axillary artery, subscapular artery |
What is the origin and insertion of the supraspinatus?
The supraspinatus muscle originates from the supraspinous fossa, which is a concave surface at the top of the scapula. From the supraspinous fossa of the scapula, the supraspinatus muscle then extends laterally (outward) and inserts onto the humerus, which is the long bone that makes up the upper arm.
What is the origin of the infraspinatus?
Infraspinatus muscle
| Origin | Infraspinous fossa of scapula |
|---|---|
| Insertion | Greater tubercle of humerus |
| Action | Shoulder joint: Arm external rotation; Stabilizes humeral head in glenoid cavity |
| Innervation | Suprascapular nerve (C5, C6) |
| Blood supply | Suprascapular artery, circumflex scapular arteries |
What is the origin of the supraspinatus?
Supraspinatus muscle
| Origin | Supraspinous fossa of scapula |
|---|---|
| Insertion | Greater tubercle of humerus |
| Action | Shoulder joint: abduction of arm, stabilization of the humeral head in the glenoid cavity |
| Innervation | Suprascapular nerve (C5, C6) |
| Blood supply | Suprascapular artery |
What is the origin and insertion of the deltoid?
The deltoid is a thick, triangular shoulder muscle. It gets its name because of its similar shape to the Greek letter ‘delta’ (Δ). The muscle has a wide origin spanning the clavicle, acromion and spine of scapula. It passes inferiorly surrounding the glenohumeral joint on all sides and inserts onto the humerus.
What muscles does the Subscapular artery supply?
The main function of the subscapular artery is to provide blood supply for the muscles and skin of the shoulder, upper extremity and thoracic wall. The supplied muscles include the deltoid, latissimus dorsi, long head of triceps brachii, subscapularis, supraspinatus, infraspinatus and serratus anterior muscles.
Where is the origin of supraspinatus?
Supraspinous fossa of scapula
Supraspinatus muscle
| Origin | Supraspinous fossa of scapula |
|---|---|
| Insertion | Greater tubercle of humerus |
| Action | Shoulder joint: abduction of arm, stabilization of the humeral head in the glenoid cavity |
| Innervation | Suprascapular nerve (C5, C6) |
| Blood supply | Suprascapular artery |
Which is the origin of the supraspinatus?
What is the origin of serratus anterior?
The serratus anterior (SA) is a fan-shaped muscle that originates on the superolateral surfaces of the first to eighth or ninth ribs at the lateral wall of the thorax and inserts along the superior angle, medial border, and inferior angle of the scapula.
What is the origin of the teres major?
The teres major muscle originates from the posterior surface of the inferior angle of scapula, as well as from the lower part of the lateral border of the scapula. At its origin, the muscle is easily palpated and felt like a soft tissue structure on the inferior scapular angle.
What is the origin of latissimus dorsi?
Origin of the latissimus dorsi is from spinous processes of thoracic T7–T12, thoracolumbar fascia, iliac crest and inferior 3 or 4 ribs, inferior angle of scapula and insertion on floor of intertubercular groove of the humerus.
What is the origin of the deltoid quizlet?
The origin of the deltoid muscle includes the anterior lateral third of the clavicle and the lateral portion of the acromion process. The insertion of the deltoid muscle is the humeral tuberosity on the lateral humerus.
Where is the subscapular artery located?
The subscapular artery, the largest branch of the axillary artery, arises from the third part of the axillary artery at the lower border of the subscapularis muscle, which it follows to the inferior angle of the scapula, where it anastomoses with the lateral thoracic and intercostal arteries, and with the descending …
What does the suprascapular artery supply?
The suprascapular artery supplies the supra- and infraspinatus muscles and travels with the suprascapular nerve. It is a direct branch from the subclavian artery (12%), the thyrocervical trunk (27%) or the internal thoracic artery (11%).
What is the origin insertion and innervation for the serratus anterior?
Origin and insertion The serratus anterior muscle originates at the 1st to 8/9th rib and inserts at the anterior surface of the medial border of the scapula (extending from the superior to inferior angles).
Where does the teres major origin and insertion?
The teres major is a thick muscle of the shoulder joint….Teres major muscle.
| Origins | Inferior angle and lower part of the lateral border of the scapula |
|---|---|
| Insertions | Intertubercular sulcus (medial lip) of the humerus |
What artery supplies the teres major?
| Teres major muscle | |
|---|---|
| Insertion | Medial lip of the intertubercular sulcus of the humerus |
| Artery | Subscapular and circumflex scapular arteries |
| Nerve | Lower subscapular nerve (segmental levels C5 and C6) |
| Actions | adduct the humerus, Internal rotation (medial rotation) of the humerus, extend the humerus from flexed position |
What is the meaning of subscapular artery?
Subscapular artery. The subscapular artery, the largest branch of the axillary artery, arises from the third part of the axillary artery at the lower border of the subscapularis muscle, which it follows to the inferior angle of the scapula, where it anastomoses with the lateral thoracic and intercostal arteries,…
What is the blood supply to the subscapularis muscle?
Blood supply to the subscapularis muscle comes from a series of branches of the subclavian artery ; Suprascapular artery, which branches off the subclavian artery via the thyrocervical trunk The subscapularis muscle is the only medial (internal) rotator of all the rotator cuff muscles.
Where does the subscapularis originate and insert?
Origin and insertion Subscapularis is a strong triangular muscle that fills the subscapular fossa of scapula. Lying posterolateral to the thoracic cage, it starts as a wide muscle whose medial two-thirds originate from the subscapular fossa of scapula and from several tendinous intramuscular septa at the ridges of the fossa.
Where does the scapular artery end?
The subscapular artery is the largest branch of the distal part of the axillary artery. It runs inferiorly at the posterior axillary wall, following the lateral margin of the subscapularis muscle. The artery terminates by dividing into two terminal branches: thoracodorsal and circumflex scapular arteries.
