Mastoid process and occipital bone Costal cartilages of inferior ribs Muscle Skin of the orbital area and eyelids Closes eye, pulls skin around the eye Orbicularis oculi Quadratus lumborum Rectus abdominis Splenius capitis Origin Iliac crest and connective tissue of lumbar region Flexes the trunk compresses abdominal cavity Spinous processes of cervical vertebrae and connective tissue of the posterior neck Insertion Extends the head, rotates the head to the same side as the muscle that is contracting Rib 12 and transverses processes of lumbar vertbrae Action Orbital portions of the " frontal bone and maxilla Superior aspects of pubic bones Extend the vertebral column; maintain posture laterally flex the vertebral column when contracted on one side only

Mastoid process and occipital bone Costal cartilages of inferior ribs Muscle Skin of the orbital area and eyelids Closes eye, pulls skin around the eye Orbicularis oculi Quadratus lumborum Rectus abdominis Splenius capitis Origin Iliac crest and connective tissue of lumbar region Flexes the trunk compresses abdominal cavity Spinous processes of cervical vertebrae and connective tissue of the posterior neck Insertion Extends the head, rotates the head to the same side as the muscle that is contracting Rib 12 and transverses processes of lumbar vertbrae Action Orbital portions of the " frontal bone and maxilla Superior aspects of pubic bones Extend the vertebral column; maintain posture laterally flex the vertebral column when contracted on one side only

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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