What does the axillary nerve innervate?
The axillary nerve innervates teres minor and deltoid muscles. Teres minor – part of the rotator cuff muscles which act to stabilise the glenohumeral joint. It acts to externally rotate the shoulder joint and is innervated by the posterior terminal branch of the axillary nerve.
What is the innervation of the teres minor?
The teres minor is innervated by the axillary nerve and supplied, in part, by the posterior humeral circumflex artery. Therefore, quadrangular space syndrome can result in selective atrophy of the teres minor, vague shoulder pain, and paresthesia.
What Innervates the deltoid muscle?
The deltoid muscle is innervated by one of the main branches of the brachial plexus, the axillary nerve (C5, C6).
What is the action and innervation of the teres minor?
Teres minor muscle
| Origin | Lateral border of scapula |
|---|---|
| Insertion | Greater tubercle of humerus |
| Action | Shoulder joint: Arm external rotation, arm adduction; Stabilizes humeral head in glenoid cavity |
| Innervation | Axillary nerve (C5, C6) |
| Blood supply | Suprascapular artery, dorsal scapular artery |
What does the Deltoideus muscle do?
Your deltoid muscles are in your shoulder, which is the ball-and-socket joint that connects your arm to the trunk of your body. Deltoid muscles help you move your arms in different directions. They also protect and stabilize your shoulder joint.
What Innervates the rotator cuff?
The suprascapular nerve comes off the upper trunk, from roots C5-C6, and innervates the supraspinatus and infraspinatus, which are contributors to the rotator cuff apparatus.
What nerve innervates the anterior deltoid?
the axillary nerve
After exiting the quadrangular space posteriorly, the anterior branch of the axillary nerve wraps around the surgical neck of the humerus, with the posterior humeral circumflex artery, to then innervate the deltoid muscle.
What nerve Innervates anterior deltoid?
What is the infraspinatus innervated by?
The suprascapular nerve (C5-C6) innervates the infraspinatus. It originates at the superior trunk of the brachial plexus. It runs laterally across the lateral cervical region to supply the infraspinatus and also the supraspinatus.
What Innervates the teres major?
The subscapular nerve from C5 to C6 roots innervates the teres major muscle. The anterior thoracic nerve from the C5 to C8 roots innervates the pectoralis major and minor, and the thoracodorsal nerve from C6 to C8 roots innervates the latissimus dorsi muscle.
What is the trapezius innervated by?
Cranial nerve XI
Cranial nerve XI innervates the motor function of the trapezius. The function of the trapezius is to stabilize and move the scapula. The upper fibers can elevate and upwardly rotate the scapula and extend the neck.
What is the Musculus deltoideus?
The musculus deltoideus belongs to the shoulder muscles. It is involved in all motions of the shoulder joint and encloses it entirely. The musculus deltoideus consists of three muscle parts: the pars spinalis (back part). All parts of the deltoid muscle have different origins.
What happens to the nerve supply to the deltoid muscle?
Due to the placement of the axillary nerve immediately below the deltoid muscle, the nerve supply to the deltoid and other upper arm muscles may also be impacted through surgery or traumatic injuries. 1 This would require more extensive rehabilitation efforts, along with potentially more procedures to attempt nerve regeneration and repair.
Where does the deltoid muscle insert?
It inserts into the deltoid tuberosity located approximately halfway down the lateral aspect of the shaft of the humerus. The deltoid is a superficial muscle of the shoulder, thus it lies deep only to its overlying fascia, the platysma muscle and skin.
What are the three muscle heads of the deltoid?
It consists of three muscle heads: the anterior deltoid, lateral deltoid, and posterior deltoid. All assist with arm elevation during a process called glenohumeral elevation and play a large role in the movement and overall stability of the shoulder joint and upper arm.