ANAT 1625 Lecture Notes - Abdomen

ANAT 1625 Lecture Notes - Abdomen - 1 Abdomen Muscles of...

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Abdomen Muscles of the anterior abdominal wall External oblique abdominis Origin 1. outer surfaces of ribs 5 to 12 2. iliac crest Insertion - continues with the aponeurosis and ends in the lina alba of the midline Nerve supply - ventral rami of T7 to T12 spinal nerves Actions 1. compresses the abdominal contents 2. both muscles flex the trunk 3. each muscle bends the trunk to the same side, turning the anterior part of the abdomen to the opposite side Internal oblique abdominis Origin 1. thoracolumbar fascia 2. iliac crest 3. lateral two thirds of the inguinal ligament Insertion 1. the aponeurosis ends in the line alba 2. conjoint tendon attaches to the pubic crest and pectineal line Nerve supply - ventral rami of T7 to T12 and L1 spinal nerves Action 1. compresses the abdominal contents 2. both muscles flex the trunk 3. each muscle bends the trunk and turns the anterior part of the abdomen to the same side Transversus abdominis Origin 1. thoracolumbar fascia 2. iliac crest 3. lateral one third of the inguinal ligament 4. costal cartilages of ribs 7 to 12 Insertion 1. the aponeurosis ends in the linea alba 1
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2. conjoint tendon attaches to the pubic crest and pectineal line Nerve supply - ventral rami of T7 toT12 and L1 spinal nerves Action - compresses the abdominal contents Rectus abdominis Origin 1. pubic crest 2. pubic tubercle 3. pubic symphysis Insertion 1. costal cartilages of ribs 5 to 7 2. xiphoid process Nerve supply - ventral rami of T7 to T12 spinal nerves Action 1. compresses the abdominal contents 2. flexes the vertebral column 3. tenses the abdominal wall Pyramidalis Origin 1. pubis 2. pubic symphysis Insertion - linea alba Nerve supply - ventral ramus of T12 / subcostal nerve Action – tenses the linea alba Linea alba Is the strong tendinous line / raphe between the two recti muscles Linea semilunaris Is the superficial crease formed by the lateral border of the rectus sheath Rectus sheath Is a tendinous sheath sorrounds the rectus abdominis, formed by the aponeuroses of the external oblique, internal oblique and transversus abdominis muscles Tendinous intersections Are three, superior, middle and inferior tendinous slips that anchor the anterior layer of the rectus sheath to the rectus abdominis muscle 2
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Layers of the abdominal wall 1. skin 2. superficial fascia – two layers a) fatty layer / Camper’s fascia is the most external layer, composed of mainly fat b) membranous layer / Scarpa’s fascia is inferior to the umbilicus, shiny tough membrane 3. external oblique abdominis 4. internal oblique abdominis 5. transversalis fascia is a thin aponeurotic membrane between transversus abdominis, rectus abdominis and extraperitoneal fat 6. extraperitoneal fat is located between the transversalis fascia and parietal peritoneum 7. parietal peritoneum serous lining on the internal surface of the abdominal wall Layers of the scrotum 1. skin 2. dartos muscle and fascia 3. external spermatic fascia 4. cramaster muscle and fascia 5. internal spermatic fascia
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This note was uploaded on 11/22/2011 for the course ANAT 1625 taught by Professor Lescane during the Winter '11 term at Life Chiropractic College West.

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ANAT 1625 Lecture Notes - Abdomen - 1 Abdomen Muscles of...

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