What bone contains the Infraspinous process?
The infraspinatus has actions on the head of the humerus. The infraspinatus insertion at the middle facet of the glenoid tubercle allows it to exert a lateral or external rotational force.
What is acromion process?
In human anatomy, the acromion (from Greek: akros, “highest”, ōmos, “shoulder”, plural: acromia) is a bony process on the scapula (shoulder blade). Together with the coracoid process it extends laterally over the shoulder joint. It articulates with the clavicle (collar bone) to form the acromioclavicular joint.
What is coracoid process?
The coracoid process is an osseous structure that arises from the superior border of the head of the scapula, projecting forward and curving laterally. The coracoid process is located directly below the lateral fourth of the clavicle and connected to its undersurface by the coracoclavicular ligament.
What are the 3 processes of the scapula?
The scapula has three processes: the acromion, the spine, and the coracoid process. Muscle attachments to these landmarks are covered in the “Muscles” section. The ventral surface of the scapula abuts the thoracic rib cage and has a large concavity called the subscapular fossa where the subscapularis attaches.
What is the infraspinous fossa of scapula?
The infraspinous fossa includes the surface of the scapula bone to which the infraspinatus muscle (sometimes written “infraspinalis” – one of the posterior muscles of the torso) is attached.
What does the infraspinous fossa do?
It arises mostly from the infraspinous fossa of scapula, and connects it to the proximal humerus….Infraspinatus muscle.
| Origin | Infraspinous fossa of scapula |
|---|---|
| Action | Shoulder joint: Arm external rotation; Stabilizes humeral head in glenoid cavity |
| Innervation | Suprascapular nerve (C5, C6) |
What is the Infraspinous fossa of the scapula?
The infraspinous fossa is the part of the scapula (bone) to which the infraspinatus (muscle) is attached.
What causes coracoid impingement?
For example, rotator cuff tears or degeneration or an unusual shape or length of the coracoid bone can lead to coracoid impingement. Calcium build up in the subscapularis bone or the formation of a ganglion cyst can also cause impingement in this area.
What are the two processes of the scapula?
The scapula bears two marked processes: the acromion and, rather less obvious, the coracoid. The acromion springs like the head of a golf club from the spine of the scapula, extends anterior to the glenoid fossa and carries a small subsidiary process, the metacromion.
Where is the Infraspinous process?
scapula
Infraspinous Fossa – large scooped out hollow beneath the spine of the scapula where the infraspinatus originates. Subscapular Fossa – this is on the anterior (front) surface of the shoulder blade.
What is infraspinous fossa?
Medical Definition of infraspinous fossa : the part of the dorsal surface of the scapula below the spine of the scapula.
What is the infraspinatus fossa?
The infraspinous fossa is the large, triangular-shaped concave surface at the back of the scapula. The infraspinous fossa contributes to both the shape and name of the infraspinatus muscle. The infraspinatus muscle originates from the infraspinous fossa at the back side of the scapula.
What is the difference between tendinous and infraspinatus?
It originates with strong muscle fibers directly from the medial two-thirds of the infraspinous fossa, whereas its tendinous fibers arise from the ridges of the fossa. Some fibers also originate from the deep surface of the thick infraspinous fascia covering the infraspinatus muscle, that separates it from the teres major and minor muscles.
What type of blood supply does infraspinatus receive?
Infraspinatus receives arterial blood supply from suprascapular and circumflex scapular arteries. Rotator cuff muscles form a functional musculotendinous unit that both stabilizes and produces movements on the shoulder joint.
Why is the infraspinatus muscle considered as one functional unit?
Due to their close anatomical relation and being separated only by the spine of scapula, infraspinatus and supraspinatus are considered as one functional unit. The infraspinatus muscle fibers course towards the shoulder joint almost parallel to the teres minor and major, separated from them by a thick fascia.
