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origin of the serratus anterior
ribs 1-9
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insertion of the serratus anterior
scapula
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action of the serratus anterior
with shoulder fixed, elevates ribs 1-9
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Back Muscles:
-Levator Scapulae
-Rhomboideus Major
-Rhomboideus Minor
-Trapezius
Muscles of Inspiration
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provides neck support and helps to elevate the scapula
levator scapulae
-
origin of the levator scapulae
transverse processes of C1-C4
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insertion of the levator
medial border of scapula
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action of the levator scapulae
elevates scapula
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lies deep to the trapezius
rhomboideus major and minor
-
origin of the rhomboideus major and minor
spinous process of T2-T5 (major); spinous process of C7-T1 (minor)
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insertion of the rhomboideus major and minor
scapula
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action of the rhomboideus major and minor
stabilizes shoulder girdle
-
massive muscle that makes up superficial upper back and neck
trapezius
-
origin of the trapezius
spinous processes of C2 to T12
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Insertion of the traps
scapula and superior surface of clavicle
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action of the traps
elongation of the neck and head control
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Muscles of the Thorax, Back, and Upper Limb
-Internal Intercostal
-Transversus Thoracis
-Subcostals
-Serratus Inferior
-Latissimus Dorsi
Muscles of Expiration
-
origin of the internal intercostals (interosseous portion)
superior margin of each rib
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insertion of the internal intercostals (interosseous portion)
run up and medially insert into inferior surface of the rib above
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action of the internal intercostals (interosseous portion)
depresses ribs 1-11
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Origin of the Transverse thoracis
lower third of the sternum
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Insertion of the Tranverse Thoracis
Inner chondral surface of ribs 2-6
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Action of the Transverse Thoracis
contraction decreases the volume of the thoracic cavity
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Vary in number; generally course parallel to the internal intercostal muscles
Subcostals
-
origin of the subcostals
inner thorax, inner surface of rib near angle
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insertion of the subcostals
inner surface of second or third rib below
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action of the subcostals
depresses thorax
-
origin of the serratus posterior inferior
spinous processes of T11-T12 and L1-L3
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Insertion of the serratus posterior inferior
lower margin of lower five ribs
-
action of the serratus posterior inferior
pull the rib cage down
-
origin of the Latissimus Dorsi
lumbar, sacral, and lower thoracic vertebrae
-
Insertion of the Latissimus Dorsi
humerus
-
action of the Latissimus Dorsi
stabilizes posterior abdominal wall for expiration
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Abdominus muscles
-Transversus Abdominis
-Internal Oblique Abdominis
-External Oblique Abdominis
-Rectus Abdominis
-Quadratus Lumborum
Muscles of Expiration
-
abdominal aponeurosis, linea alba, and the linea semulnaris form the
abdominal skeleton
-
tendonous expansion across the abdomen which serves as an attachment point for muscles
abdominal aponeurosis
-
"white line" runs from the xiphoid process to the pubic symphysis
linea alba
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division of the linea alba into two sheets of aponeurosis
linea semilunaris
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biological functions of the abdomen
force air out of the lungs, vomiting, thoracic fixation, childbirth
-
deepest layer of the anterior abdominal muscles
transversus abdominis
-
origin of the transversus abdominis
posterior abdominal wall at the vertebral column
-
insertion of the transversus abdominis
transversus abdominis aponeurosis, inner ribs 6-12, and inferior attachment at the pubis
-
action of the transversus abdominis
compress abdomen
-
found between external oblique and transverse abdominis
internal oblique abdominis
-
origin of the internal oblique abdominis
inguinal ligament, ilac crest, the cartilaginous portion of the lower ribs, abdominal aponeurosis
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insertion of the internal oblique abdominis
linea alba
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action of the internal oblique abdominis
rotates and flexes trunk, compresses abdomen
-
most superficial and largest of the abdominal muscles
external oblique abdominis
-
origin of the external oblique abdominis
lower seven ribs
-
insertion of the external oblique abdominis
iliac crest, inguinal ligament, and abdominal aponeurosis
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action of the external oblique abdominis
flexes vertebral column, trunk rotation, compresses abdomen
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midline muscles on sides of linea alba made up of three fibrous bands that cross the stomach
rectus abdominis
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origin of the rectus abdominis
originates as four or five segments at the pubic inferiorly
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insertion of the rectus abdominis
xiphoid process of sternim and cartilage of last true rib (7) and the false ribs
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action of the rectus abdominis
compresses abdomen
-
located on the dorsal portion of the abdominal wall
quadratus lumborum
-
origin of the quadratus lumborum
iliac crest
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insertion of the quadratus lumborum
transverse processes of the lumbar vertebrae and inferior border of rib 12
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action of the quadratus lumborum
unilateral contraction-lateral movement of trunk; bilateral contraction-abdominal compression
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