TAMU BIOL 319 Lab 4: Anatomical Terms and Muscle Functions

Obliques

A: compression of abdomen, flexion, and rotation of trunk

O: external ribs and internal illiac crest

I: external illiac crest and internal ribs

Transverse Abdominis

A: compression of abdomen

O: ribs and illiac crest

I: linea alba

Rectus Abdominis

A: flexion of trunk; compression of abdominal wall

O: pubic crest

I: xiphoid process and ribs 5-7

Intercostals

A: elevation and depression of ribs

O: superior border of ribs (external) and inferior border of ribs (internal)

I: inferior border of ribs (external) and superior border of ribs (internal)

Diaphram

A: opens thoracic cavity for lungs during inspiration

O: ribs 5-10 and lumbar vertebrae

I: central tendon

Frontalis

A: raises eyebrows

O: epicranial aponeurosis

I: skin of eyebrows and root of nose

Occipitalis

A: pulls scalp posteriorly

O: occipital bone

I: epicranial aponeurosis

Temporalis

A: closes jaw; retracts mandible

O: temporal fossa

I: coronoid process

Masseter

A: closes jaw

O: zygomatic arch

I: angle and ramus (mandible)

Zygomaticus

A: elevates corners of mouth

O: zygomatic bone

I: corners of mouth

Buccinator

A: compression of cheek

O: molar region (maxilla and mandible)

I: orbicularis oris

Platysma

A: tenses skin of neck; depression of lower lip

O: fasci of chest

I: mandible and corner of mouth

Orbicularis Oculi

A: closes eye

O: frontal bone and maxilla

I: eyelids

Orbicularis Oris

A: closes and protrudes lips

O: maxilla and mandible

I: angles of mouth

Levator Labii Superioris

A: elevation of upper lip

O: zygomatic bone and infraorbial margin

I: upper lip

Depressor Labii Superioris

A: depression of lower lip

O: body of mandible

I: lower lip

Sternocleidomastoid

A: flexion and rotation of neck

O: manubrium and clavicle

I: mastoid process

Scalenes

A: elevation of ribs 1&2; rotation of neck

O: transverse process of C3-C7

I: ribs 1&2

Serratus Anterior

A: abduction and rotation of scapula

O: true ribs

I: medial border of scapula

Rhomboids

A: adduction and elevation of scapula

O: spinous process of C7-T5

I: medial border of scapula

Splenius

A: rotation of head; extension of neck

O: spinous process of C7-T6

I: temporal and occipital bone

Digastric

A: elevation of hyoid; opens mouth

O: lower margin(mandible); mastoid process(temporal bone)

I: hyoid bone

Mylohyoid

A: elevation of hyoid and floor of mouth

O: medial surface (mandible)

I: hyoid bone

Geniohyoid

A: elevation and protraction of hyoid bone

O: mental turbercule

I: hyoid bone

Sternohyoid

A: depression of hyoid and larynx

O: manubrium

I: hyoid bone

Sternothyroid

A: depression of hyoid and larynx

O: manubrium

I: thyroid cartilage

Thyrohyoid

A: depression of hyoid; elevation of larynx

O: thyroid cartilage

I: hyoid bone