Chapter 4 Flashcards
_____________= other end that is attached to the more movable part
Insertion
_____________=end of muscle that is attached to the least movable structure
Origin
________________= the movement accomplished when muscle fibers contract
Action
Cervical muscles are in the _____________
Neck
The muscles of the head and neck are divided into ___ main groups
7
Name the 7 groups of muscles in the head and neck
Cervical Facial expression Mastication Hyoid Tongue Soft palate Pharynx
One of the largest and most superficial cervical muscles is the paired _________________________ muscle
Sternocleidomastoid muscle
Sternocleidomastoid originates from where?
Medial portion of clavicle & sternum (superior and lateral surfaces)
What is the action of the sternocleidimastoid (SCM)?
If 1 muscle contracts, the head and neck bend to the same side & the face and front of the neck rotate to the opposite side.
The SCM is innervated by the ______________________
11th cranial nerve (Accessory nerve)
Paired muscle which covers the lateral & posterior surfaces of the neck
Trapezius muscle
SCM inserts where?
Mastoid process
The trapezius muscle originates from where?
Occipital bone & posterior midline of the cervical and thoracic regions
The trapezius muscle inserts where?
Clavicle & scapula
What is the action of the trapezius muscle?
Lift the clavicle and scapula (shrug your shoulders)
Trapezius muscle is innervated by the ____________________
11th cranial nerve (accessory nerve)
Muscles of facial expression all originate from bone or fascia and insert on the ___________
Skin
All muscles of facial expression are innervated by the ____________________
7th cranial nerve (Facial nerve)
Paired muscles in the superficial fascia of the facial tissues= _______________________
Muscles of facial expression
_____ muscles to smile
_____ muscles to frown
17
43
The muscles of facial expression are situated in the ___________________________
Scalp, eye, or mouth region
__________________ is a muscle of facial expression located in the scalp region
Epicranial muscle
The epicranial muscle raises the _________________________
Eyebrows & scalp (when person shows surprise)
_________________________ is a muscle of facial expression that encircles the eye
Orbicularis oculi muscle
Orbicularis oculi muscle originates from where?
Orbital rim, nasal process of frontal bone, & frontal process of the maxilla
Orbicularis oculi inserts where?
Lateral region of the eye
What is the action of the orbicularis oculi muscle?
Closes the eyelid
__________________ is a muscle of facial expression in the eye region, deep to the superior portion of the orbicularis oculi muscle
Corrugator supercilii muscle
Corrugator Supercilii Muscle
Origin
Insertion
Action
Origin- frontal bone
Insertion- skin tissue of eyebrow
Action-draws skin tissue of the eyebrow medially & inferiorly toward the nose (causing wrinkles)
______________is an important muscle of facial expression in the mouth region
Orbicularis oris muscle
Orbicularis Oris Muscle
Origin
Insertion
Action
Origin- encircles mouth
Insertion- skin tissue @ angle of mouth
Action- close lips, pursing lips, grimacing, and pouting/kissing
_______________________ is a muscle of facial expression that fiend the anterior portion of the cheek or lateral wall of the oral cavity
Buccinator Muscle
Buccinator Muscle
Origin
Insertion
Action
Origin- maxilla, mand, & pterygomandibular raphe
Insertion- angle of mouth
Action- chewing
__________________ is a thin muscle of facial expression in the mouth region
Risorius Muscle
Risorius Muscle
Origin
Insertion
Action
Origin- fascia superficial to masseter muscle
Insertion- angle of mouth
Action- stretch lips laterally
A broad, flat muscle of facial expression in the mouth region is?
Levator labii superioris
Levator labii superioris originates from the infraorbital rim of the maxilla and inserts where?
Skin tissue of upper lip (it elevates the upper lip)
