Health Sciences 2300A/B Lecture Notes - Medial Pectoral Nerve, Lateral Pectoral Nerve, External Intercostal Muscles

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The Muscular System (Muscles of the Trunk)11/6/2012 11:34:00 AM
Deep Back Muscles
Illiocostalis:
Origin of illiocostalis is iliac crest
Insertion is the ribs
Longissimus:
Spinalis:
Runs by the spinous process.
The true back muscles, keep you upright. Extend the trunk. Maintain
balance.
Missing a whole chunk
Intercostals (between the ribs) :
Between the ribs is the External intercostal muscles. Involved in inspiration
If the external ICs are peeled away, then the internal Intercostals are
revealed. These are involed in expiration.
There is a third layer that is called the innermost intercostal layer.
Nerves that innervate are called intercostal nerves and vessels. Also
inervate the abdominal muscles. (rectus abdominus, external oblique, etc)
They run in the intervertebral foramen.
External inercostal:
Origin: inferior border of rib
Insertion: superior portion of the rib below
Any muscles with attachments to the ribs will influence in forced breathing.
Diaphraghm:
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Innervation comes from the phrenic nerve.
Innervation comes from the phrenic nerve.
C 3,4,5 keep the diaphragm alive.
Is at the bottom of the ribcage.
If there is a injury to spinal accord above or below c3 then there is damage
to the phrenic nerve and breathing needs to be assisted.
Is at the bottom of the ribcage.
If there is a injury to spinal accord above or below c3 then there is damage
to the phrenic nerve and breathing needs to be assisted.
Attachements: xiphoid process, ribs and costal cartilages, lumbar vertebral
bodies.
There is a central tendon in the middle of the muscle.
Vena hiatus: hole that lets the inferior vena cava pass through
Esophagial hiatus: allows the esophagus to run through the diaphragm
Aorta
Perineum and the Pelvic Diaphragm:
2 layers in each gener
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Document Summary

The muscular system (muscles of the trunk)11/6/2012 11:34:00 am. Between the ribs is the external intercostal muscles. If the external ics are peeled away, then the internal intercostals are revealed. There is a third layer that is called the innermost intercostal layer. Nerves that innervate are called intercostal nerves and vessels. Also inervate the abdominal muscles. (rectus abdominus, external oblique, etc) Any muscles with attachments to the ribs will influence in forced breathing. If there is a injury to spinal accord above or below c3 then there is damage to the phrenic nerve and breathing needs to be assisted. Attachements: xiphoid process, ribs and costal cartilages, lumbar vertebral bodies. There is a central tendon in the middle of the muscle. Vena hiatus: hole that lets the inferior vena cava pass through. Esophagial hiatus: allows the esophagus to run through the diaphragm. Muscles of pectoral girdle and upper limb11/6/2012 11:34:00 am know muscular attachments common nerve supply muscular function.

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