RMT 101 Quiz 4

Rectus Capitis Posterior Major

O: spinous process of axis (C2) | I: lateral portion of inferior nuchal line | A: extension + ipsilateral rotation of head | N: suboccipital nerve (dorsal rami of C1)

Rectus Capitis Posterior Minor

O: posterior tubercle of atlas (C1) | I: medial portion of inferior nuchal line | A: extension of head | N: suboccipital nerve (dorsal rami of C1)

Obliquus Capitis Superior

O: transverse process of atlas (C1) | I: between nuchal lines on occipital bone | A: extension & lateral flexion of head | N: suboccipital nerve (dorsal rami of C1)

Obliquus Capitis Inferior

O: spinous process of axis (C2) | I: transverse process of atlas (C1) | A: ipsilateral rotation of head | N: suboccipital nerve (dorsal rami of C1)

Sternocleidomastoid (SCM)

O: sternal head = manubrium of sternum

clavicular head = medial 1/3 of clavicle | I: mastoid process of temporal bone + lateral half of nuchal line | A: unilateral = rotation to contralateral side + lateral flexion to ipsilateral side

bilateral = neck flexion + capital (C0-C1) extension | N: motor = spinal accessory nerve (CN XI)

sensory = ventral rami of C2

C3

Digastric

O: posterior belly = mastoid notch of temporal bone

anterior belly = digastric fossa of mandible | I: body of hyoid (both bellies meet via pulley tendon) | A: elevates hyoid bone

depresses mandible (opens mouth)

anterior belly = trigeminal nerve (CN V)

Stylohyoid

O: styloid process of temporal bone | I: lateral margin of hyoid body (base of greater horn) | A: elevates hyoid during swallowing

Geniohyoid

O: inner surface of mandible (mental spines) | I: body of hyoid (paired

Mylohyoid

O: inner surface of mandible (mylohyoid line) | I: body of hyoid anterior surface along midline at mylohyoid raphe | A: elevates hyoid bone (raises floor of mouth for swallowing)

Thyrohyoid

O: thyroid cartilage (oblique line) | I: body of hyoid bone | A: depresses hyoid bone

Sternothyroid

O: manubrium of sternum (posterior aspect) | I: thyroid cartilage (oblique line) | A: depresses thyroid cartilage

Sternohyoid

O: manubrium & sternoclavicular joint (posterior aspect) | I: body of hyoid bone | A: depresses hyoid & larynx

Omohyoid

O: superior scapular border

Rectus Capitis Anterior

O: atlas (C1)

Rectus Capitis Lateralis

O: atlas (C1)

Longus Capitis

O: anterior tubercles of transverse processes

Longus Cervicis (Colli)

O: lower anterior vertebral bodies & transverse processes of C3-T3 | I: anterior vertebral bodies & transverse processes of C1-C6 | A: flexion & lateral flexion of neck

Scalenus Minimus

O: transverse processes of C6-C7 (anterior tubercle) | I: 1st rib and/or suprapleural membrane of lung | A: flexion & lateral flexion of neck

Anterior Scalene

O: transverse processes of C3-C6 (anterior tubercles) | I: scalene tubercle of 1st rib | A: flexion & ipsilateral flexion of neck

Middle Scalene

O: transverse processes of C2-C7 (posterior tubercles) | I: 1st rib (behind anterior scalene) | A: flexion & ipsilateral flexion of neck

Posterior Scalene

O: transverse processes of C5-C7 (posterior tubercle) | I: 2nd rib | A: ipsilateral lateral flexion of neck

Aryepiglotticus

O: apex of arytenoid cartilage | I: lateral border of epiglottis | A: aids in closure of aditus of larynx | N: vagus nerve (CN X)

Thyroepiglotticus

O: lower posterior surface of thyroid cartilage | I: lateral border of epiglottis | A: aids in closure of aditus of larynx | N: vagus nerve (CN X)

Thyroarytenoid

O: lower posterior surface between laminae of thyroid cartilage | I: vocal process of arytenoid cartilage | A: shortens & relaxes vocal cords by medial rotation & protraction of arytenoid cartilage | N: vagus nerve (CN X)

Lateral Cricoarytenoid

O: lateral aspect of arch of cricoid | I: muscular process of arytenoid cartilage | A: adducts & medially rotates arytenoid cartilage

Posterior Cricoarytenoid

O: posterior aspect of cricoid cartilage | I: muscular process of arytenoid cartilage | A: abducts & laterally rotates arytenoid cartilage

Arytenoideus (transverse)

O: posterior surface & muscular process of arytenoid cartilage | I: surfaces of opposite side cartilage | A: adducts arytenoid cartilage

lies horizontal over posterior larynx | N: vagus nerve (CN X)

recurrent laryngeal branch

Oblique Arytenoideus

O: muscular process of arytenoid cartilage | I: superior pole of opposite arytenoid cartilage | A: adducts arytenoid cartilages

the two muscles cross forming an X shape | N: vagus nerve (CN X)

recurrent laryngeal branch

Cricothyroid

O: anterolateral aspect of cricoid cartilage | I: inferior cornu & lower lamina of thyroid cartilage | A: lengthens & tenses vocal cords by tilting thyroid cartilage forward | N: vagus nerve (CN X)