Chapter 10 & 11 - axial musculature 2 and appendicular musculature 1 Organ 2012

Chapter 10 & 11 - axial musculature 2 and appendicular musculature 1 Organ 2012

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1 Muscles of the Neck The key muscle of the neck is the sternocleidomastoid It is innervated by the 11 th cranial nerve (CN XI) - the Accessory n. It rotates and orients the face cranially It divides the neck into two triangles, the anterior and posterior. Note that the anterior (located between the two sternocleidomastoid mm is an upside down triangle). The attachments of this muscle are clearly outlined in its name: sternum (sterno), clavicle (cleido) and mastoid process .
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2 Muscles of the Neck The hyoid bone is a convenient bony landmark of the neck. It has numerous muscles that attach to it, that are for the most part, thin, flat, and strap-like in shape. They are divided into: Suprahyoids : those strap-like muscles above the hyoid bone – Digrastric, Stylohyoid, Mylohyoid, Geniohyoid Infrahyoids: those strap-like muscles below the hyoid bone – Sternothyroid, Sternohyoid, Thyrohyoid, Omohyoid These muscles aid in swallowing and also can move the larynx superiorly. They do this by elevating and depressing the hyoid. hyoid bone
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Strap musculature of the neck Sternocleidomastoid Cricothyroid Sternothyroid Sternohyoid Sternal head Omohyoid Digastric Mylohyoid Sternum Clavicle Mandible Hyoid bone Thyroid cartilage of larynx Mylohyoid (cut and reflected) Thyrohyoid Stylohyoid Geniohyoid Clavicular head Anterior view Cut heads of sternocleidomastoid Superior belly Inferior belly Sternocleidomastoid (cut) Anterior belly Posterior belly
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Ansa cervicalis: a loop of cervical nerves; (C1, C2, C3) Muscles of the Neck
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Muscles on the anterior surfaces of the cervical and upper thoracic vertebrae Longus capitis Posterior scalene Slips of anterior scalene Anterior scalene Middle scalene Anterior scalene Rib 2 Longus colli Rib 1 T T T C C C C C C C 1 2 3 4 5 6 7 3 2 1 Muscles of the neck
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Lateral view Esophagus Inferior pharyngeal constrictor Stylopharyngeus Middle pharyngeal constrictor Palatopharyngeus Superior pharyngeal constrictor Salpingopharyngeus Levator veli palatini Esophagus Inferior pharyngeal constrictor Middle pharyngeal constrictor Palatopharyngeus Stylopharyngeus Superior pharyngeal constrictor Levator veli palatini Tensor veli palatini Midsagittal view Pharyngeal Constrictors Consider all three constrictors together. All innervated by Vagus n.
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Muscles of the Trunk Muscles of the thoracic wall The thoracic wall is composed of 3 layers superficial to deep: external intercostals internal intercostals innermost intercostals (not seen from exterior) As their name implies, they are found between ribs . Their innervation is directly from the ventral ramus of the spinal nerve at each level, and they function in elevating the ribs during respiration. external
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This note was uploaded on 03/27/2012 for the course HEALTH 350 taught by Professor Cooper during the Spring '12 term at MO St. Louis.

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Chapter 10 & 11 - axial musculature 2 and appendicular musculature 1 Organ 2012

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