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54 terms

Muscles of the Head, Neck and Trunk

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Epicranius
Two muscles and an aponuerosis (galea aponeurotica)
Galea aponeurotica
Aponeurosis
Epicranius
Frontalis and Occipitalis
Frontalis
Elevates eyebrows and wrinkles forehead
Occipitalis
Draws scalp backward
Orbicularis Oculi
Closes eye (wink)
Orbicularis Oris
Closes and puckers lips (kiss)
Zygomaticus Major
Elevates corner of mouth
Depressor Anguli Oris
Depresses corner of mouth (frown)
Buccinator
Pulls cheecks against teeth when chewing
Platysma
Very superficial neck muscle; tenses skin of neck and dpresses lower lip
Masseter
Elevates mandible
Temporalis
Elevates and retracts mandible
Medial and Lateral Pyterygoids
Elevate madible and moves mandible side to side
Genioglossus
Portracts (protrudes) and depresses tongue
Styloglossus
Retracts and elevates tongue (attached to styloid process)
Hyoglossus
Depresses side of tongue
Sternocleidomastoid
Lateral Neck Muscle
Sternocleidomastoid
Each rotates head to one side; when one is contracted, your head is turned to the opposte side
Sternocleidomastoid
Together they flex the neck/head (bring it down)
Sternocleidomastoid
Extends from the manubrium (sternum) and clavicle and attach to the mastoid processes
Splenius Capitus
Posterior Neck Muscle
Splenius Capitus
Each rotates head to one side; together they extend the neck/head
Suprahyoid Muscles
Digastic, Stylohyoid, Mylohyoid, Geniohyoid
Infrahyoid Muscles
Sternohyoid, Omohyoid, Sternothyroid, Thyrohyoid
Digastric
Elevates hyoid bone and depresses mandible
Stylohyoid
Elevates hyoid bone
Mylohyoid
Elevates hyoid and raises floor of mouth
Geniohyoid
Elevates hyoid bone (2)
Sternohyoid
Depresses hyoid
Omohyoid
Depresses hyoid (2)
Sternothyroid
Depresses thyroid cartilage (front of voice box)
Thyrohyoid
Depresses hyoid bone and raises thyroid cartilage
Back Muscle
Superficial back muscles, deep back muscles
Deep Back Muscles
Muscles of the vertebral column
Quadratus Lumborum
Together, they extend the lumbar vertebral column
Quadratus Lumborum
Unilaterally, each laterally flexes the vertebral column; attaches to transverse processes of lumbar vertebra
Erector Spinae
Extend the vertebral column (standing upright)
Erector Spinae
Consists of iliocostalis, longissimus, and spinalis
Iliocostalis
Most lateral erector spinae
Longissimus
Intermediate erector spinae
Spinalis
Most medial erector spinae
Deep Thorax Muscles
Diaphragm, external intercostals, internal intercostals, and scalenes
Deep Thorax Muscles
Respiratory Muscles
Diaphragm
Contraction pulls the central portion down, increasing vertical dimensions of throax
External Intercostals
Elevates rivs during inhalation; between ribs; very superficial
Internal Intercostals
Depresses ribs during exhalation
Internal Intercostals
Deep to external intercostals
Scalenes
Elevates ribs during in inspiration
Abdominal Muscles
As a group, they compress the abdominal contents and flex the vertebral column
Abdominal Muscles
External Abdominal Oblique, Internal abdominal oblique, transversus abdominis, and rectus abdominis
Pelvic Floor and Perineum Muscles
Known as the "pelvic diaphragm" or "urogenital diaphragm"
Pelvic Floor and Perineum Muscles
Closes inferior opening of pelvis
Pelvic Floor and Perineum Muscles
Supports the pelvic organs