Class Two Flashcards
(39 cards)
External jugular vein
Beginning
Near mandible angle, below parotid, by union of post division post facial (retromandibular) v & post auricular v
Course
Descends obliquely on sternomastoid, then superficial to deep fascia of posterior triangle roof
End
1 inch above clavicle, it pierces deep fascia of roof & descends inside posterior triangle to end in subclavian vein
Tributaries
Post. auricular v
Post division post facial v
Suprascapular v
Transverse cervical v
Ant jugular v
Posterior external jugular v which drains scalp back and
upper part of neck back, joins middle of EJV
Anterior jugular vein
Beginning
Just above hyoid, by union of submental veins
Anterior jugular vein
Course & end
Descends in superficial fascia of neck near midline reaching supra-sternal notch, where it shifts lat. deep to sternomastoid & infront of scalenus ant. to reach post. triangle & ends in E.J.V. Both ant. jugular vv. are connected above sternum by jugular arch
Sternomastoid muscle origin
Sternal head; rounded & tendinous, from front of upper part manubrium sterni
Clavicular head; broad & fleshy, from upper surface of med 1\3 clavicle
Sternomastoid muscle origin
Sternal head; rounded & tendinous, from front of upper part manubrium sterni
Clavicular head; broad & fleshy, from upper surface of med 1\3 clavicle
Where does the muscle insert?
Lat. surface mastoid process & lat. half sup. nuchal line.
What is the motor nerve supply for the muscle?
Spinal root accessory n.
What is the sensory nerve supply for the muscle?
Ant. rami C2,3.
What is the action of one muscle?
Bends head to same side & rotates face to opposite side.
What is the action of two muscles?
Flexes neck by projecting head forwards & raising head from supine.
What is the formation of the cervical plexus?
Anterior rami of the upper 4 cervical nerves.
Where is the cervical plexus located?
Opposite the upper 4 cervical vertebrae, covered by sternomastoid and IJV.
What are the branches of the cervical plexus?
Communicating branches with the last 3 cranial nerves, cutaneous branches (great auricular, lesser occipital, transverse cutaneous nerve of the neck, supraclavicular), and muscular branches.
What muscles does the lateral group of the cervical plexus supply?
Sternomastoid, trapezius, levator scapulae, scalenus medius.
What muscles does the medial group of the cervical plexus supply?
Longus colli, longus capitis, rectus capitis anterior, and rectus capitis lateralis.
What does the descendens cervicalis (inferior root of ansa cervicalis) supply?
Supplies infrahyoid muscles except thyrohyoid.
What is the function of the phrenic nerve?
Descends on scalenus anterior, supplying the diaphragm.
Which cervical nerves contribute to the phrenic nerve?
C3, C4, and C5.
What is the largest and longest vertebral muscle?
Scalenus Medius
Where does the Scalenus Medius originate?
All cervical transverse processes.
What are the origins of the Scalenus Anterior?
Anterior tubercles of C3, C4, C5, & C6 transverse processes.
