Human Movement Science & Functional Anatomy of the:
by Brent Brookbush DPT, PT, MS, PES, CES, CSCS, ACSM H/FS
The Subclavius Muscle - http://upload.wikimedia.org/wikipedia/commons/3/32/Subclavius_muscle_frontal3.png
What’s in a name
- Clavicle – Etymology: L, clavicula, little key (Medical Dictionary)
- Sub - word-forming element meaning "under, beneath; behind; from under; resulting from further division," from Latin preposition sub "under, below, beneath, at the foot of," also "close to, up to, towards;" of time, "within, during;" figuratively "subject to, in the power of;" also "a little, somewhat" (as in sub-horridus "somewhat rough"). (Etymology Online)
- Muscle under the key-shaped bone
Origin of Subclavius - http://upload.wikimedia.org/wikipedia/commons/3/3d/Gray115.png
Origin: Attaches to the junction of the first rib with its cartilage, by a short thick tendon (8, 11).
Insertion: Inferior surface of middle 1/3 of clavicle in the "subclavian groove" (8, 11).
Insertion of Subclavius - http://upload.wikimedia.org/wikipedia/commons/f/f0/Gray201.png
Note the "nerve to subclavius" originating from the junction of nerve roots C5 & C6 - http://upload.wikimedia.org/wikipedia/commons/thumb/0/0e/Brachial_plexus_2.svg/864px-Brachial_plexus_2.svg.png
- Clavicle: Anterior rotation, protraction and depression of the clavicle (8, 11)
- Respiration: The subclavius may aid in forceful inspiration by elevating the first rib (14).
Note how the brachial plexus courses under the subclavius, but splits at the pectoralis minor.
- The subclavius muscle is a deep