Muscles of the Head, Neck and Trunk

54 terms by akrzesni

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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

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