Muscular System Coop Quiz I Muscles of the Head, Neck, and Abdomen

Handsome

Yikes!

Lovely

Muscles of the Head: Mastication and Swallowing Mastication: – Masseter – Temporalis Swallowing: – Suprahyoid (pull hyoid up) Digastric Mylohyoid – Infrahyoid (pull hyoid down) Sternohyoid

Muscles of Neck: Head Movements Sternocleidomastoid: – Flexes and laterally rotates head Splenius: – Extends and hyperextends head

“Six Pack”

“Beer Belly”

Muscles of the Abdominal Wall: Trunk Movements and Compression External and Internal Obliques: – Lateral flexion of lumbar region of spine – Compression of abdominal walls Rectus Abdominis: – Flex lumbar region of spine Transverse Abdominis: – Compression of abdominal walls Linea alba: – Aponeuroses/point of insertion

Figure A superficial lateral view showing the largest muscles of mastication of the right side of the head Superior temporal line Temporalis Capsule of temporomandibular joint Zygomatic arch Masseter

Figure An anterior view showing superficial muscles on the right side of the face, and deeper muscles on the left side of the face. Epicranial aponeurosis Temporalis Corrugator supercilii Procerus Levator labii superioris Levator anguli oris Masseter Buccinator Depressor anguli oris Depressor labil inferioris Thyroid cartilage of the larynx Clavicle Frontal belly of occipitofrontalis Orbicularis oculi Nasalis Zygomaticus minor Zygomaticus major Orbicularis oris Risorius Platysma Mentalis (cut)

Figure Serratus anterior Internal intercostal External intercostal External oblique (cut) Internal oblique Cut edge of rectus sheath Rectus abdominis Linea alba Tendinous inscription External oblique The muscles of the trunk: the superficial muscles on the right side of the body, and deeper muscles of the oblique and rectus groups on the left side of the body

Figure Rectus sheath Rectus abdominis Linea alba Quadratus lumborum External oblique Transversus abdominis Internal oblique Thoracolumbar fascia Horizontal section through the abdominal cavity L3L3 The muscles of the trunk: In the anterior view, the superficial muscles are shown on the right side of the body, and deeper muscles of the oblique and rectus groups are shown on the left side