Facial Muscles, Origins, & Insertions

[INCLUDES REAL CADAVER IMAGES FROM MCGRAW HILL'S A&P REVEALED FOR EDUCATIONAL PURPOSES] Muscle origins & insertions. Images from A&P Revealed by McGraw Hill & Google. Made for Prof. Michael Mastrangelo's A&P I Lab.

What muscle is this?

Buccinator

What is/are this muscle’s origin(s)?

• Pterygomandibular raphe

• Maxilla (lateral aspect)

• Mandible (lateral body)

What is/are this muscle’s insertion(s)?

Blends with muscles at angle of mouth

Raphe

A “seam” where two structures meet

What muscle is this?

Digastric

What is/are this muscle’s origin(s)?

• Anterior belly: mandible (inner aspect of body near midline)

• Posterior belly: temporal bone (mastoid process)

What is/are this muscle’s insertion(s)?

Hyoid bone

What muscle is this?

Frontalis

What is/are this muscle’s origin(s)?

Epicranial aponeurosis

What is/are this muscle’s insertion(s)?

• Skin of eyebrow and forehead

• Blends with orbicularis oculi muscle

What muscle is this?

Levator scapulae

What is/are this muscle’s origin(s)?

Transverse processes of C1-4 vertebrae

What is/are this muscle’s insertion(s)?

Scapula (superior angle and medial border)

What muscle is this?

Masseter

What is/are this muscle’s origin(s)?

Zygomatic arch

What is/are this muscle’s insertion(s)?

Mandible (external surface of angle and ramus)

What muscle is this?

Occipitalis

What is/are this muscle’s origin(s)?

Occipital bone (superior nuchal line)

What is/are this muscle’s insertion(s)?

Epicranial aponeurosis

What muscle is this?

Occipitofrontalis

What is/are this muscle’s origin(s)?

• Occipitalis: occipital bone (superior nuchal line)

• Frontalis: skin of eyebrow and forehead (blends with orbicularis oculi muscle)

What is/are this muscle’s insertion(s)?

Epicranial aponeurosis

What muscle is this?

Orbicularis oculi

What is/are this muscle’s origin(s)?

• Frontal bone

• Maxilla

What is/are this muscle’s insertion(s)?

Fibers blend at lateral side of orbit

What muscle is this?

Orbicularis oris

What is/are this muscle’s origin(s)?

• Skin around mouth

• Mandible (midline)

• Maxilla (midline)

What is/are this muscle’s insertion(s)?

• Lips

• Interdigitation with fibers from opposite side

What muscle is this?

Platysma

What is/are this muscle’s origin(s)?

Fascia of upper thorax and lower neck

What is/are this muscle’s insertion(s)?

• Mandible (lower border)

• Skin and fascia of lower face

• Blends with muscles of lower lip and angle of mouth

What muscle is this?

Sternocleidomastoid

What is/are this muscle’s origin(s)?

• Clavicle (medial)

• Sternum (manubrium)

What is/are this muscle’s insertion(s)?

• Mastoid process of temporal bone

• Lateral one-half of superior nuchal line of occipital bone

What muscle is this?

Sternohyoid

What is/are this muscle’s origin(s)?

• Sternum (manubrium)

• Clavicle (medial end)

What is/are this muscle’s insertion(s)?

Hyoid

What muscle is this?

Sternothyroid

What is/are this muscle’s origin(s)?

Sternum (manubrium)

What is/are this muscle’s insertion(s)?

Thyroid cartilage of larynx

What muscle is this?

Temporalis

What is/are this muscle’s origin(s)?

Temporal fossa (formed by parts of frontal, parietal, sphenoid (greater wing), and temporal bones)

What is/are this muscle’s insertion(s)?

Mandible (coronoid process and ramus)

What muscle is this?

Trapezius

What is/are this muscle’s origin(s)?

• Occipital bone (superior nuchal line)

• Nuchal ligament

• Vertebra prominens (spinous process of C7 vertebra)

• Spinous processes of T1-12 vertebrae

What is/are this muscle’s insertion(s)?

• Clavicle (lateral)

• Scapula (spine and acromion)

What muscle is this?

Zygomaticus major

What is/are this muscle’s origin(s)?

Zygomatic bone

What is/are this muscle’s insertion(s)?

Blends with muscles at angle of mouth