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11 Cards in this Set

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Diaphragm m.
Origin xiphoid process
inner aspect of R7-R12
lumbar vertebrae
Insertion: Central tendon
The primary muscle of inhalation; increases the longitudinal volume of the thoracic cavity and compresses the abdominal visera
External Intercostals M.
Origin: Lower border of R1-R11
Insertion: Upper surface of the rib immediately below
As each successive upper rib is anchored, the rib immediately below is elevated
Internal interchrondal Intercostals m.
Origin: Lower border of R1-R11
Upper surface of the rib immediately below
The portions fo the muscles along the anterior rib cage (ie sternum) act similarly to the external intercostals
serratus anterior m.
Origin: R1-R8 sometimes 9
Insertion: Outer surface of the ribs and inner surface of the scapula
With scapula fixed, elevates R1-R8 and in some cases R9
serratus posterior superior m
Origin: Spinous process of C7 and T1-T2 sometimes T3
Insertion: lateral to the angle of R2-R5
Elevates R2-R5
Sternocleidomastoid M
Origin: Sternum: anterior manubrium, Clavicle: proximal sternal end
Insertion: 2 heads unite and attach to mastoid process
with the head fixed elevates the sternum and clavicle
trapezius m
Origin: external occipital protuberance & superior nuchal line of occipital bone spinous process C7-T12
Insertion: lateral 1/3 of clavicle acromion + spine of scapula
maintains trunk stability for respiration
pectoralis major m
greater tubercle of humerous
scalenus m. :anterior, medius, and posterior
Origin: Transverse process of C2-C7
Insertion: upper surfaces of Ribs 1+2
Elevate ribs
scalenus m. :anterior, medius, and posterior
Origin: Transverse process of C2-C7
Insertion: upper surfaces of Ribs 1+2
Elevate ribs
scalenus m. :anterior, medius, and posterior
Origin: Transverse process of C2-C7
Insertion: upper surfaces of Ribs 1+2
Elevate ribs