Head and Neck Muscles

Where's the origin for the scn?

Clavicle and sternum

What's the insertion for the scn?

Mastoid process of the temporal bone

What's the function of the SCN?

Neck movements

What's the origin of the Trapezius?

Occipital bone and posterior midline of

cervical and thoracic regions

What family does the buccinator belong to?

Facial expression, mouth region

What family does the Risorius belong to?

Facial expression, mouth region

What's the insertion of the zygomaticus major?

Skin tissue at angle of mouth

What does the zygomaticus major do?

Elevates angle of lips, smile

What family does the Depressor Anguli Oris Muscle belong to?

Facial expression, lower region

What family does the Depressor Labii inferiors Muscle belong to?

Facial expression, lower region

What family does the Mentalis muscle belong to?

Facial expression, mouth region

What do the four infrahyoid muscles do?

depress hyoid bone

sternothyroid → which depresses only thyroid cartilage and larynx

thyrohyoid - also raises thyroid cartilage and

larynx

What do the extrinsic tongue muscles do?

Move it

2 muscles of the cervical group?

SCN and trapezius

What's the insertion of the trapezius?

Clavicle and scapula

What's the function of trapezius?

Shrugs shoulder

What family does the Orbicularis Oris belong to?

Facial expression of the mouth region

What family does the Levator Labii Superiors belong to?

Facial expression, mouth region

What family does the Levator Labii Superioris Alaeque

Nasi belong to?

Facial expression, mouth region

What family does the Zygomatic Major and Minor belong to.

Facial expression, mouth region

What's the origin of the zygomaticus major?

Zygomatic bone

What is the origin of the zygomaticus minor?

Zygomatic bone

What's the insertion of the zygomaticus minor?

Tissue of upper lip

What does the zygomaticus minor do?

Elevates upper lip

What family does the Levator Anguli Oris Muscle belong to?

Facial expression, mouth region

What is the Platysma Muscle?

Covers anterior triangle of the neck

What's one key fact about the muscles of mastication vs facial expression?

Located deeeper

Where do all muscles of mastication insert?

Mandible

What are the muscles of mastication?

Masseter, temporalis, Medial Pterygoid

Muscle (internal pterygoid), Lateral Pterygoid

Muscle (external pterygoid)

What does the masseter do?

Bilateral contraction, elevates lower jaw

What does the temporalis do?

Elevates the mandible, if the posterior part contracts only→retraction

What does the Medial Pterygoid Muscle (internal

pterygoid) do?

Raising Lower jaw, parallels the action of the

masseter

What does the Lateral Pterygoid Muscle (external

pterygoid) do?

Depresses mandible

When both sides contract = protrusion. Moves jaw side to side

What are the 3 anterior suprahyoid muscles?

Digastric, mylohyoid, and geniohyoid

What do the three anterior suprahyoid muscles do?

Depresses mandible and opens jaw, mylohyoid forms floor of mouth and elevates tongue

What are the two posterior suprahyoid muscles?

Digastric and stylohyoid

What do the two posterior suprahyoid muscles do?

Elevation of hyoid bone and larynx if mandible is

stabilized by muscles of mastication

What are the four infrahyoid muscles?

Sternothyroid, Sternohyoid, Omohyoid, Thyrohyoid

What are the four intrinsic tongue muscles?

Superior Longitude, Transverse, Vertical, Inferior Longitudinal

What do the intrinsic tongue muscles do?

Change the shape

What are the extrinsic tongue muscles?

Styloglossus, Genioglossus, Hypoglossus