OP Group 1 Flashcards
What is the origin of the trapezius?
EOP, nuchal line, nuchal ligament
What is the insertion of the trapezius?
Lateral 1/3 of clavicle, acromion, spine of scapula
What are the actions of the trapezius?
Unilateral: lateral flexion of head; Bilateral: extension of head, elevation of scapula, retraction of scapula, upward rotation of scapula, downward rotation of scapula
What is the innervation of the trapezius?
(Spinal) accessory nerve (CN XI), cervical spinal nerves (dorsal rami)
What is the origin of the sternocleidomastoid (SCM)?
Sternal head: manubrium of sternum; Clavicular head: medial portion of clavicle
What is the insertion of the sternocleidomastoid (SCM)?
Mastoid process
What are the actions of the sternocleidomastoid (SCM)?
Rotation of head to contralateral side; Lateral flexion to ipsilateral side; Bilateral action: neck flexion
What is the innervation of the sternocleidomastoid (SCM)?
Motor: spinal accessory nerve (CN XI); Sensory: cervical spinal nerves (ventral rami)
What is the origin of the anterior scalene?
TPs of C3-C6
What is the insertion of the anterior scalene?
1st rib
What are the actions of the anterior scalene?
Flexion and ipsilateral lateral flexion of neck; Elevation of 1st rib
What is the innervation of the anterior scalene?
Cervical spinal nerves, ventral rami
What is the origin of the levator scapulae?
TPs of C1-C4
What is the insertion of the levator scapulae?
Medial border of scapula (superior part)
What are the actions of the levator scapulae?
Elevation of scapula; Extension and lateral flexion of neck
What is the innervation of the levator scapulae?
Dorsal scapular nerve
What is the origin of the digastric muscle?
Posterior belly: mastoid process; Anterior belly: digastric fossa of mandible
What is the insertion of the digastric muscle?
Hyoid bone (both bellies)
What are the actions of the digastric muscle?
Elevation of hyoid bone; Depression of mandible; Stabilizes hyoid bone for infrahyoid action
What is the innervation of the digastric muscle?
Posterior belly: facial nerve (CN VII); Anterior belly: trigeminal nerve (CN V)
What is the origin of the splenius cervicis?
SPs of T3-6
What is the insertion of the splenius cervicis?
TPs of C1-C3
What are the actions of the splenius cervicis?
Unilateral: ipsilateral rotation and lateral flexion of neck; Bilateral: extension of neck
What is the innervation of the splenius cervicis?
Cervical spinal nerves (dorsal rami)
What is the origin of the sternohyoid?
Manubrium and sternoclavicular joint
What is the insertion of the sternohyoid?
Body of hyoid bone
What are the actions of the sternohyoid?
Depression of hyoid bone and larynx
What is the innervation of the sternohyoid?
Ansa cervicalis
What is the origin of the longus capitis?
TPs of C3-C5
What is the insertion of the longus capitis?
Occipital bone (anterior foramen magnum)
What are the actions of the longus capitis?
Flexion of head and neck
What is the innervation of the longus capitis?
Cervical spinal nerves (ventral rami)
