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45. Enumerate the cutaneous branches of the cervical plexus, zone of innervation.

Ans: Cutaneous branches of cervical plexus and zone of innervation:

  • The lesser occipital nerve, or small occipital nerve, is a cutaneous spinal nerve that arises between the second and third cervical vertebrae, along with the greater occipital nerve. It innervates the scalp in the lateral area of the head posterior to the ear.

  • The great auricular nerve originates from the cervical plexus and is composed of branches from spinal nerves C2 and C3. It provides sensory innervation for the skin over the parotid gland and mastoid process, and both surfaces of the outer ear.

  • The transverse cervical nerve (superficial cervical or cutaneous cervical) arises from the second and third cervical nerves, turns around the posterior border of the sternocleidomastoideus about its middle, then passes obliquely forward beneath the external jugular vein to the anterior border of the muscle, where it perforates the deep cervical fascia and divides beneath the platysma into ascending and descending branches that are distributed to the antero-lateral parts of the neck.

  • The supraclavicular nerves (descending branches) arise from the third and fourth cervical nerves. They emerge beneath the posterior border of the sternocleidomastoideus, and descend in the posterior triangle of the neck beneath the platysma and deep cervical fascia.

46. Nuclei and branches of trigeminal nerve.

Ans: It consist of three main division – ophthalmic nerve, maxillary nerve, mandibular nerve.

The ophthalmic and the maxillary nerves are the sensory nerve, while the mandibular nerve has the both motor and sensory.

47. Formation of the spinal nerves.

Ans: The spinal cord gives attachment on either side of the 31 pair.

  • 8 are cervical

  • 12 thoracic

  • 5 lumbar

  • 5 sacral

  • 1 coccygeal

Each spinal cord arises by two roots: anterior motor root and the posterior sensory root. The junction of the two root, the dorsal root is marked by the swelling called the dorsal nerve root or the spinal ganglion.

After emerging from the intervertebral foramen each spinal nerve is divided into the dorsal and the ventral ramus.

48. Blood supplying of the muscles of facial expression.

Ans: Facial artery of the external carotid artery

49. Topography of the subclavian artery, branches of the first part.

Ans: The right subclavian artery is the part of the brachiocephalic trunk and begin behind the right sternoclavicular joint, the left subclavian artery is a direct branch from the arch of aorta.

The first part has three branches:

  • Vertebral artery

  • Thyrocervical artery

  • Internal thoracic artery

50. Internal jugular vein, sources of formation and its branches.

Ans: The internal jugular vein are the chief vein of the head and the neck. They collect the blood from the brain and the superficial part of the face and the neck. Each jugular vein begin as a continuation of the sigmoid sinus of that side at the base of the skull in the posterior compartment of the jugular foramen.

Branches of the jugular vein:

  • Inferior petrosal sinus

  • Pharyngeal

  • Common facial vein

  • Lingual vein

  • Superior thyroid vein

  • Middle thyroid vein

  • Occipital vein

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