The infraglenoid tubercle is the part of the
scapula
The scapula (plural scapulae or scapulas), also known as the shoulder blade, is the bone that connects the humerus (upper arm bone) with the clavicle (collar bone). Like their connected bones, the scapulae are paired, with each scapula on eithe ...
from which the long head of the
triceps brachii muscle
The triceps, or triceps brachii (Latin for "three-headed muscle of the arm"), is a large muscle on the back of the upper limb of many vertebrates. It consists of 3 parts: the medial, lateral, and long head. It is the muscle principally responsibl ...
originates. The infraglenoid tubercle is a
tubercle
In anatomy, a tubercle (literally 'small tuber', Latin for 'lump') is any round nodule, small eminence, or warty outgrowth found on external or internal organs of a plant or an animal.
In plants
A tubercle is generally a wart-like projection ...
located on the
lateral
Lateral is a geometric term of location which may refer to:
Healthcare
*Lateral (anatomy), an anatomical direction
*Lateral cricoarytenoid muscle
*Lateral release (surgery), a surgical procedure on the side of a kneecap
Phonetics
*Lateral cons ...
part of the scapula,
inferior to (below) the
glenoid cavity
The glenoid fossa of the scapula or the glenoid cavity is a bone part of the shoulder. The word ''glenoid'' is pronounced or (both are common) and is from el, gléne, "socket", reflecting the shoulder joint's ball-and-socket form. It is a sha ...
. The name infraglenoid tubercle refers to its location below the glenoid cavity.
Function
The infraglenoid tubercle is the origin of the long head of the
triceps brachii muscle
The triceps, or triceps brachii (Latin for "three-headed muscle of the arm"), is a large muscle on the back of the upper limb of many vertebrates. It consists of 3 parts: the medial, lateral, and long head. It is the muscle principally responsibl ...
.
It helps to stabilise the muscle origin.
Additional images
File:Infraglenoid tubercle of left scapula - animation.gif, Left scapula. Infraglenoid tubercle shown in red.
File:Infraglenoid tubercle of scapula - animation01.gif, Animation. Infraglenoid tubercle shown in red.
File:Infraglenoid tubercle of left scapula01.png, Lateral view of left scapula. Infraglenoid tubercle shown in red.
File:Scapula ant numbered.png, Anterior surface of left scapula. Infraglenoid tubercle is "11"
File:Infraglenoid tubercle of left scapula03.png, Anterior surface of left scapula. Infraglenoid tubercle shown in red.
See also
*
Supraglenoid tubercle
The supraglenoid tubercle is a region of the scapula from which the long head of the biceps brachii muscle originates. It is a small, rough projection superior to the glenoid cavity near the base of the coracoid process. The term supraglenoid is ...
References
External links
* - "Axillary Region: Scapula (Left)"
* ()
Scapula
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