Anatomical terminology The triangular space (also known as the medial triangular space, upper triangular space, medial axillary space or foramen omotricipitale) is one of the three spaces found at the axillary space. The other two spaces are the quadrangular space and the triangular interval.

What muscles make up the triangular space?

Triangular Space

• Borders. inferior: teres major. lateral: long head of triceps. superior: lower border of teres minor.
• Contents. scapular circumflex artery.

What runs through quadrangular space?

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

What nerve is in the quadrangular space?

The axillary nerve and PHCA reside in the quadrilateral space. The axillary nerve innervates the teres minor and deltoid muscles, which are primarily responsible for abduction and external rotation.

What vessel is found in the triangular interval?

Triangular interval (lower triangular space)

The profunda brachii artery and the radial nerve pass through this space to enter the arm.

Boundaries and Contents of the Quadrangular Space, Triangular Space, & Triangular Interval

35 related questions found

What is triangular space?

Triangular space is the medial space. The scapular and circumflex arteries.
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It has the following boundaries:

• Inferior: the superior border of the teres major;
• Lateral: the long head of the triceps;
• Superior: Teres minor or Subscapularis.

What is found in 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).

Where is the teres minor?

The teres minor arises from the posterior surface of the scapula, directly adjacent to the upper part of its lateral border. The upper fibers of the muscle culminate in a tendon that inserts on the greater tubercle of the humerus. The tendon blends into the capsule of the shoulder joint.

What is Intermuscular spaces of arm?

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's in the triangular interval?

Anatomical terminology

The triangular interval (also known as the lateral triangular space, lower triangular space, and triceps hiatus) is a space found in the axilla. It is one of the three intermuscular spaces found in the axillary space. The other two spaces are: quadrangular space and triangular space.

What are Intermuscular spaces?

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 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.

Where are deltoid muscle?

The Deltoid muscle is a large triangular shaped muscle which lies over the glenohumeral joint and which gives the shoulder its rounded contour. It is named after the Greek letter delta, which is shaped like an equilateral triangle.

What nerve runs through triangular space?

The axillary nerve and the posterior humeral circumflex artery pass through this space from anterior to posterior. The triangular space is an anatomic interval medial to the quadrangular space. Its borders are formed by the long head of the triceps laterally, the teres minor superiorly, and the teres major inferiorly.

What is Brachioradialis innervated by?

Due to its location in the posterior compartment of the forearm the brachioradialis is innervated by the radial nerve. The innervation involves contribution from C5-C6 spinal nerve roots (C7 innervation sometimes is cited).

What is Subscap?

The subscapularis is a muscle in your shoulder that helps you internally rotate your arm. ... The subscapularis connects from your shoulder blade to your humerus, or upper arm bone. All the muscles of the rotator cuff, including the subscapularis, can tear from overuse, trauma, or age-related conditions.

What is the difference between intramuscular and intermuscular?

As adjectives the difference between intermuscular and intramuscular. is that intermuscular is (anatomy) between muscles while intramuscular is inside a muscle or the muscles.

What is Triangle auscultation?

The triangle of auscultation is a relative thinning of the musculature of the back, situated along the medial border of the scapula which allows for improved listening to the lungs.

Where is the radial groove?

The radial sulcus ( also known as the musculospiral groove, radial groove, or spiral groove) is a broad but shallow oblique depression for the radial nerve and deep brachial artery. It is located on the center of the lateral border of the humerus bone.

Can you pull your teres major?

Extreme amounts of pressure can cause the muscle to tear, resulting in pain and difficulty with activities that require sideways or backwards movements with the arm. Isolated tears of the teres major are quite uncommon, but may occur in baseball or cricket players, especially pitchers and bowlers.

Does Infraspinatus abduct or adduct?

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.

Can you palpate the teres major?

The Teres Major muscle can be palpated from two different locations: 1. Just below the caudal angle of the scapula 2. Deep in the posterior axilla In palpating you are looking both at observable muscle spasm or twitch as well as patient discomfort (as exhibited by a yelp, a whine, or an attempt to bite or flee.)

Is the scapula?

The scapula, or shoulder blade, is a large triangular-shaped bone that lies in the upper back. The bone is surrounded and supported by a complex system of muscles that work together to help you move your arm.

How do you remember the quadrangular space?

Triangular space, Quadrangular Space- Scapula [Mnemonic]

1. Triangular Space – TS (aka– Medial or Upper Triangular space, Foramen omotricipitale),
2. Quadrangular Space – QS (aka– Quadrilateral space of Velpeau, Foramen humerotricipitale),
3. Triangular Interval – TI (aka– Lateral or Lower Triangular space, Triceps hiatus).

Where does brachioradialis attach?

The brachioradialis is a superficial, fusiform muscle on the lateral side of the forearm. It originates proximally on the lateral supracondylar ridge of the humerus. It inserts distally on the radius, at the base of its styloid process. Near the elbow, it forms the lateral limit of the cubital fossa, or elbow pit.