Back Muscles Flashcards
extrinsic muscles control…
Upper extremity and Respiration
NOT BACK FUNCTIONS
Intrinsic muscles have two categories:
Superficial - PROXIMAL TO DISTAL ATTACHMENT
* Back - erector spinae (INFEROMEDIAL TO SUPROLATERAL)
* neck - splenius cervicis and capitis
Deep - Transversospinalis: from transverse process to spinous process (INFEROLATERAL TO SUPEROMEDIAL)
Superficial intrinsic muscles have what kind of attachment?
Proximal to distal
Intrinsic superficial back muscles include _______
erector spinae
Erector Spinae is what orientation?
Inferomedial to superolateral
Neck intrinsic muscles include _____
splenius cervicis and capitis
Deep intrinsic muscle and its direction
transversospinalis - from transverse process to spinous process. INFEROLATERAL to SUPEROMEDIAL
Superficial intrinsic muscle
erector spinae
Deep intrinsic muscle
transversospinalis
Must superficial extrinsic back muscle
Trapezius and Latissimus dorsi
Trapezius function:
elevation, upward rotation and adduction of scapula
Latissimus dorsi function:
IR/EXT/ADD of glenohumeral joint, accessory muscle for expiration
Rhomboid minor function
elevation, downward rotation and retraction/adduction of scapula
Rhomboid major function
elevation, downward rotation and retraction/adduction of scapula
What are the three muscles in the Iliocostalis
Lumborum, Thoracis, and Cervicis
What are the function of the Iliocostalis muscles
Back EXT (bilateral), Side Bending or RT (Left & Right)
Lumborum and thoracis do what:
Depression of rib cage, expiration
Iliocostalis is innervated and has blood supply from
Dorsal rami of spinal nerve
