1/13
Looks like no tags are added yet.
Name | Mastery | Learn | Test | Matching | Spaced |
---|
No study sessions yet.
Sternocleidomastoid
Origin
Lateral surface of mastoid process of temporal bone and lateral half of superior nuchal line
Insertion
Sternal Head: anterior surface of manubrium of sternum
Clavicular Head: superior medial clavicle
Peripheral Innervation
N/A
Segmental Innervation
Spinal Accessory N. (CN XI, motor), C3 and C4 nerves (pain and proprioception)
Action
Unilateral Contraction: ipsilateral side bend, contralateral rotation of cervical spine
Bilateral Contraction:
(1) extends head at atlanto-occipital joints
(2) lower cervical flexion
(3) extends superior cervical vertebrae while flexing inferior vert. so chin is thrust forward w/ head kept level
Trapezius
Origin
Medial third of superior nuchal line; external occipital protuberance; nuchal ligament; spinous processes of C7-T12
Insertion
Lateral third of clavicle, acromion, and spine of scapula
Peripheral Innervation
N/A
Segmental Innervation
Spinal Accessory N. (CN XI; motor) C3 and C4 nerves (pain and proprioception
Action
Upper trapezius: scapular elevation; Lower trapezius: scapular depression; Middle trapezius: scapular retraction; Upper and Lower together: part of force couple that upwardly rotates scapula
Levator Scapulae
Origin
Posterior tubercles of transverse processes of C1-C4
Insertion
Medial border of scapula superior to root of scapular spine
Peripheral Innervation
Dorsal Scapular
Segmental Innervation
C5 and cervical spinal nerves C3 and C4
Action
Scapular elevation and downward rotation
Scalenus Anterior
Origin
Transverse processes of C3-C6
Insertion
1st rib
Peripheral Innervation
Cervical spinal nerves C4-C6 (cervical VPR)
Segmental Innervation
Cervical spinal nerves C4-C6 (cervical VPR)
Action
Cervical flexion; elevates 1st rib during forced inspiration
Scalenus Medius
Origin
Posterior tubercles of transverse processes of C5-C7
Insertion
Superior surface of 1st rib; posterior to groove for subclavian artery
Peripheral Innervation
Anterior rami of cervical spinal nerves (Cervical VPR)
Segmental Innervation
Anterior rami of cervical spinal nerves (Cervical VPR)
Action
Cervical lateral flexion; elevates 1st rib during forced inspiration
Scalenus Posterior
Origin
Posterior tubercles of transverse processes of C5-C7
Insertion
External border of 2nd rib
Peripheral Innervation
Anterior rami of cervical spinal nerves C7 and C8 (Cervical VPR)
Segmental Innervation
Anterior rami of cervical spinal nerves C7 and C8 (Cervical VPR)
Action
Cervical lateral flexion; elevates 2nd rib during forced inspiration
Digastric (anterior/posterior belly, and intermediate tendon)
Peripheral Innervation
Nerve to mylohyoid a branch of inferior alveolar nerve
Digastric (preparotid) branch of facial nerve (CN VII)
Segmental Innervation
Nerve to mylohyoid a branch of inferior alveolar nerve
Digastric (preparotid) branch of facial nerve (CN VII)
Action
Fixate and elevate hyoid
Stylohyoid
Peripheral Innervation
Sylohyoid (preparotid) branch of facial nerve (CN VII)
Segmental Innervation
Sylohyoid (preparotid) branch of facial nerve (CN VII)
Action
Fixate and elevate hyoid
Mylohyoid
Peripheral Innervation
Nerve to mylohoid, a branch of inferior alveolar nerve(from mandicular nerve CN V3)
Segmental Innervation
Nerve to mylohoid, a branch of inferior alveolar nerve(from mandicular nerve CN V3)
Action
Fixate and elevate hyoid
Geniohyoid
Peripheral Innervation
C1 via hypoglossal nerve (CN XII) and nerve to geniohyoid
Segmental Innervation
C1 via hypoglossal nerve (CN XII) and nerve to geniohyoid
Action
Fixate and elevate hyoid
Sternohyoid
Peripheral Innervation
C1-C3 by a branch of ansa cervialis
Segmental Innervation
C1-C3 by a branch of ansa cervialis
Action
Fixate/depress hyoid and thyroid cartilage
Omohyoid (superior and inferior belly)
Peripheral Innervation
C1-C3 by a branch of ansa cervialis
Segmental Innervation
C1-C3 by a branch of ansa cervialis
Action
Fixate/depress hyoid and thyroid cartilage
Sternothyroid
Peripheral Innervation
C2 and C3 by a branch of ansa cervialis
Segmental Innervation
C2 and C3 by a branch of ansa cervialis
Action
Fixate/depress hyoid and thyroid cartilage
Thyrohyoid
Peripheral Innervation
C1 via hypoglossal nerve (CN XII) and nerve to thyrohyoid
Segmental Innervation
C1 via hypoglossal nerve (CN XII) and nerve to thyrohyoid
Action
Fixate/depress hyoid and thyroid cartilage