Health Sciences 2300A/B Lecture Notes - Medial Pectoral Nerve, Lateral Pectoral Nerve, External Intercostal Muscles
1 Mar 2013
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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.
