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The Muscular System.docx

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Health Sciences
Health Sciences 2300A/B
Jeremy Roth

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: 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 Muscles of Pectoral Girdle and Upper Limb 11/6/2012 11:34:00 AM know muscular attachments common nerve supply muscular function ***Brachial Plexus*** (know for exam):  runs from C4 to T2. Different levels of the spinal chord contribute to it. Purpose of plexus is Redundancies in inervation in regards to a particular nerve. If there is damage to a level of the spinal chord, there can still be partial inervation due to the multiple levels of spinal chord that are contributing to innervation. Muscles of the Pectoral Girdle: Separated into 2 groups: 1. Muscles that move the shoulder (directly move the scapula and clavicle) a. anterior Subclavius: Originates off of the first rib and inserts on the underside of clavicle  Braces the clavicle to withstand forces generated it o Innervated by the subclavian nerve (nerve to subclavian muscle) Pectoralis Minor: Minor muscle of the pectoral muscles Originates rib 3 to rib 5 (varies in individuals) and inserts in the corcoid process of the corcoid process of the scapula Causes abduction. Pulls the scapula down (causes downwards roation) also abduction Innervated by medial pectoral nerve (both medial and lateral pectoral nerve innervate the pectoralis major). Serratus Anterior: Originates from rib 1 to rib 9 Insertion point is medial border of the scapula (wraps underneath) Contraction of the muscles causes abduction of scapula as well as upwards rotation of the scapula It is innervated by the long thoracic nerve. One fuction of serratus anterior is to keep scapula tight to the back of the rib cage. Winging Scapulae : excessive abduction of scapula (individuals with this often end up with broken clavicles) Coracobrachialis
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