The quadrangular space transmits the axillary nerve

Which nerve exits through the quadrangular space?

The axillary nerve is identified within the quadrangular space. A superficial cutaneous branch of the axillary nerve lies along the triceps, which can be identified as a landmark and followed proximally to the proper axillary nerve.

Which artery is passed through the triangular Intermuscular space?

The Triangular Intermuscular Space is defined by borders of the teres major, teres minor, and long head of the triceps. Through this space pass the descending circumflex scapular artery, vena comitants, and lymphatics.

What goes through the triangular interval?

Triangular Interval Syndrome It is a condition where the radial nerve is entrapped in the triangular interval resulting in upper extremity radicular pain. The radial nerve and profunda brachii pass through the triangular interval and are hence vulnerable.

What are anatomical spaces?

In anatomy, a spatium or anatomic space is a space (cavity or gap). Anatomic spaces are often landmarks to find other important structures. When they fill with gases (such as air) or liquids (such as blood) in pathological ways, they can suffer conditions such as pneumothorax, edema, or pericardial effusion.

What nerves are related to bony prominences and the triangular and quadrangular spaces formed by overlapping muscles attached to the scapula?

• profunda brachii artery.
• radial nerve.

What is the inferior boundary of the quadrangular space?

Located in the axilla, the quadrangular space is bordered superiorly by subscapularis muscle (by teres minor muscle when viewed posteriorly), inferiorly by teres major muscle, laterally by the surgical neck of the humerus and medially by the long head of triceps brachii muscle.

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 are the contents of quadrangular space?

Three muscles directly comprise the quadrangular space; the teres minor, teres major, and long head of the triceps brachii. The teres minor originates on the lateral border of the scapula, inserts on the greater tubercle of the humerus, and functions with glenohumeral joint external rotation.

What Innervates the teres minor?

The teres minor is innervated by the axillary nerve and supplied, in part, by the posterior humeral circumflex artery.

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What is the profunda brachii artery?

The profunda brachii artery also referred to as the deep brachial artery, is the first and largest branch of the brachial artery. It originates from the posterior portion of the brachial artery, just inferior to the lower border of the teres major muscle.

What is the Subpectoral space?

Retropectoralis minor space or subpectoralis minor space is the lateral most space traversed by brachial plexus and adjacent artery and vein as they pass from the axilla to the thorax, and is thus a location of potential compression leading to thoracic outlet syndrome.

What artery accompanies the radial nerve in the radial groove of the humerus?

The radial nerve lies posterior to the axillary artery in the axilla and enters the posterior compartment of the arm under teres major muscle via the triangular interval. In the posterior compartment of the arm, it winds its way around the spiral groove of the humerus, accompanying profunda brachii artery.

What does the axillary nerve innervate?

The axillary nerve supplies three muscles in the arm: deltoid (a muscle of the shoulder), triceps (long head) and teres minor (one of the rotator cuff muscles).

What structures leave the axilla through the lateral triangle space?

• deltoid.
• rotator cuff. supraspinatus. infraspinatus. teres minor. subscapularis.
• teres major.

What is triangular space?

The triangular space (medial axillary space, lat. foramen omotricipitale) is bounded by the teres minor superiorly, the teres major inferiorly, and the long head of the triceps brachii laterally. It contains the scapular circumflex vessels (axillary artery – subscapular artery – scapular circumflex artery).

What is quadrangular Intermuscular space?

The quadrangular space is an intermuscular space through which the axillary nerve and posterior circumflex humeral vessels pass through backwards to encircle the surgical neck of the humerus. It is bounded above by subscapularis and teres minor and below by teres major.

What are the branches of axillary artery?

It has three branches that are variable in their order: the subscapular trunk, the anterior humeral circumflex artery, and the posterior humeral circumflex artery.

What does the circumflex scapular artery supply?

The circumflex scapular artery is the largest terminal branch of the subscapular artery. … They contribute to the blood supply of three muscles (deltoid, teres minor, triceps brachii), glenohumeral joint and two small cutaneous areas partially overlying the scapula.

Which structure passes through the quadrangular space of the posterior scapular region gateways?

Contents. The quadrangular space transmits the axillary nerve, and the posterior humeral circumflex artery.

Which joint is formed where the humerus and scapula meet?

The shoulder joint is formed where the humerus (upper arm bone) fits into the scapula (shoulder blade), like a ball and socket. Other important bones in the shoulder include: The acromion is a bony projection off the scapula. The clavicle (collarbone) meets the acromion in the acromioclavicular joint.

Which two structures form the junction of the clavicle and scapula?

The scapula and clavicle articulate with the bones of the thorax at one point only, here, at the sternoclavicular joint. The lateral end of the clavicle articulates with this projection on the scapula, the acromion, forming the acromio-clavicular joint.

Where does teres major attach?

OriginsInferior angle and lower part of the lateral border of the scapulaInsertionsIntertubercular sulcus (medial lip) of the humerusInnervationLower subscapular nerve (C5-C7)Blood supplyThoracodorsal branch of subscapular artery and posterior circumflex humeral artery

What is the teres major?

Teres major is a small muscle that runs along the lateral border of the scapula. It forms the inferior border of both the triangular space and quadrangular space. It’s sometimes called “lat’s little helper” because of its synergistic action with the latissimus dorsi.

What muscle does the radial nerve stimulate?

Radial nerve gives out muscular branches to supply the long head, medial head, and lateral head of triceps brachii muscles before and during its course in the radial sulcus. After it emerges out from the radial sulcus, it supplies the brachialis, brachioradialis and extensor carpi radialis longus.

Does Infraspinatus abduct?

Infraspinatus is the main external rotator of the shoulder joint. It assists in producing shoulder extension. With the arm fixed, it abducts the inferior angle of the scapula.

What does Thoracodorsal nerve supply?

The thoracodorsal nerve is a pure motor nerve that innervates the latissimus dorsi muscle. … The primary blood supply of the latissimus dorsi muscle is the thoracodorsal artery. The dorsal divisions of T6 to T12 provide the sensory innervation of the skin of the latissimus dorsi muscle.

What nerve Innervates subscapularis?

The subscapularis is innervated by both the upper subscapular nerve (USN) and lower subscapular nerve (LSN). Both the USN and LSN arise from the posterior cord of the brachial plexus.

Is the teres minor posterior?

Teres minor is a posterior muscle of the shoulder that extends between the scapula and the head of humerus. It is one of the four muscles of the rotator cuff, along with the supraspinatus, infraspinatus and subscapularis.

What nerve innervates the deltoid and teres minor muscles?

Usually, the axillary nerve contains fibers from the C5 and C6 ventral rami. This nerve innervates the teres minor and deltoid muscles, the skin over the shoulder (upper lateral brachial nerve), and the glenohumeral joint.

What nerve Innervates deltoid?

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.