Neck and Head Flashcards
Sternocleidomastoid Origin
- Manubrium 2. Medial 1/3 of clavicle
Sternocleidomastoid Insertion
Mastoid Process
Sternocleidomastoid Innervation
Accessory Nerve (CN XI)
Sternocleidomastoid Action
- Flexes the neck 2. Rotates head to opposite side
Digastric Origin
Posterior belly: Mastoid process. Anterior belly: Inner mandible, just lateral to the midline
Digastric Insertion
Hyoid Bone
Digastric Innervation
Posterior Belly: Facial nerve (CN VII) Anterior Belly: Trigeminal nerve (CNV3)
Digastric Action
- Moves hyoid superiorly and posteriorly in swollowing 2. Opens jaw against resistance
Omohyoid Origin
Inferior belly: Superior margin of scapula. Superior belly: Hyoid
Omohyoid Insertion
Intermediate tendon attaches to posterior clavicle and 1st rib by fascial sling
Omohyoid Innervation
Branches of Ansa cervicalis
Omohyoid Action
Strap muscles as a group depress larynx, hyoid bone and floor of mouth during swallowing
Sternohyoid Origin
Manubrium
Sternohyoid Insertion
Hyoid bone
Sternohyoid Innervation
Branches of Ansa cervicalis
Sternohyoid Action
Strap muscles as a group depress larynx, hyoid bone, and floor of mouth during swallowing
Sternothyroid Origin
Manubrium
Sternothyroid Insertion
Thyroid cartilage
Sternothyroid Innervation
Branches of ansa cervicalis
Sternothyroid Action
Strap muscles as a group depress larynx, hyoid bone, and floor of mouth during swallowing
Ansa cervicalis innervates
Omohyoid, Sternohyoid, Sthernothyroid
Strap muscles
Thyrohyoid, Sternothyroid, Sternohyoid, Omohyoid
Thyrohyoid Origin
Thyroid cartilage
Thyrohyoid Insertion
Hyoid Bone
Thyrohyoid Innervation
C1 fibers that run with hypoglossal nerve (CN XII)
Thyrohyoid Action
Strap muscles as a group depress larynx, hyoid bone, and floor of mouth during swallowing
Masseter Origin
Zygomatic arch
Masseter Insertion
Ramus of mandible
Masseter Innervation
Mandibular division of CN V (V3)
Masseter Action
- Closes mandible. 2. Protracts mandible 3. Deep fibers retract mandible
Temporalis Origin
Temporal fossa
Temoralis Insertion
Coronoid process of mandible
Temporalis Innervation
Mandibular division of CN V (V3)
Mandibular division of CN V (V3) innervates
Masseter, Temporalis, Lateral Pterygoid, Medial Pterygoid
Lateral Pterygoid Origin
Lateral pterygoid plate (lateral surface)
Lateral Pterygoid Insertion
1) Neck of mandible. 2)TM joint capsule 3)Articular disk
Lateral Pterygoid Innervation
Mandibular division of cranial nerve V (V3)
Lateral Pterygoid Action
1)Opens Mandible 2)Protracts mandible 3)Protracts during abduction (opposite side to abduction)
Temporalis Action
1) Closes Mandible 2) Retracts Mandible. 3) Abduct towards side of abduction
Medial Pterygoid Origin
Lateral pterygoid plate, medial side
Medial Pterygoid Insertion
Ramus of mandible, inner surface
Medial Pterygoid Innervation
Mandibular Division of CN V (V3)
Medial Pterygoid Action
Closes Mandible
Longus Capitis Origin
Transverse processes of mid-cervical vertebrae
Longus Capitis Insertion
Occipital Bone
Longus Capitis Innervation
Segmental cervical ventral rami
Longus Capitis Action
Flexes head and neck
Longus Coli Origin
Vertical portion: Lower cervical vertibrae.
Upper Oblique portion: upper cervical bodies.
Lower ObliquePortion: lower cervical bodies
Longus Coli Insertion
Vertical portion: upper cervical vertebrae.
Upper Oblique portion: Mid-cervical transverse processes
Lower Oblique portion: Mid cervical transverse Processes
Longus Coli Innervation
Segmental Ventral Rami
Longus Coli Action
Flexes neck