Anterior Neck Muscles Flashcards
2 Fascial Compartments of the Neck
1) . Superficial Cervical Fascia
2) . Deep Cervical Fascia
what is in the superficial cervical fascia compartment?
hypodermis, cutaneous nerves, blood and lymph vessels, fat and platysma
what are the 3 general layers of the Deep Cervical Fascia?
1) . Investing layer
2) . Peritracheal layer
3) . Prevertebral layer
what is in the investing layer?
SCM and trapezius
what is in the peritracheal layer?
trachea, esophagus, thyroid glands, and infrahyoid muscles
what is the peritracheal layer?
middle layer of deep cervical fascia, forms a CT tube from hyoid to thoracic inlet
what is the prevertebral layer?
deep layer of deep cervical fascia; forms a CT tube around C vert column and muscles
what is in the prevertebral layer?
- longus colli
- longus capitis
- scalenes
- posterior deep cervical muscles
- sympathetic chain ganglia
what other compartments/spaces are found in the neck?
carotid sheaths, retropharyngeal space and Alar fascia
what is in the carotid sheaths?
carotid arteries, jugular veins, vagus nerves, and lymphatics
what is the retropharyngeal space?
space between pretracheal and prevertebral fascia
what is the purpose of the retropharyngeal space?
slick surface to allow for movement of organs, increase ROM
what is the purpose of the alar fascia?
interconnects carotid sheaths, subdivides retropharyngeal space
superficial muscles of the neck
1) . Platysma
2) . Sternocleidomastoid
3) . Trapezius
Suprahyoid muscles
1) . Mylohoid
2) . Geniohyoid
3) . Stylohoid
4) . Digastric
Mylohoid origin
mandible and raphe
Mylohoid insertion
hyoid
Mylohoid innervation
CN5
Geniohyoid origin
mandible
Geniohyoid insertion
hyoid
Geniohyoid innervation
cervical plexus
Stylohyoid origin
temporal bone/styloid process
Stylohyoid insertion
hyoid
Stylohoid innervation
CN 7
Anterior digastric origin
mandible
Anterior digastric insertion
hyoid sling
Posterior digastric origin
temporal/mastoid
Posterior digastric insertion
hyoid sling
Anterior digastic innervation
CN 5
Posterior digastric innervation
CN 7
main action of all suprahyoid muscles?
elevate the larynx
Infrahyoid muscles
1) Sternohyoid
2) . Omohyoid
3) . Sternothyroid
4) . Thyrohyoid
Sternohyoid prox attachment
sternum
Sternohyoid distal attachment
Hyoid
Sternohyoid innervation
cervical plexus
Sternohyoid action
depress larynx
Omohyoid prox attachment
S: clavicle sling
I: scapula/notch
Omohyoid distal attachment
S: hyoid
I: clavicle sling