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Head and Neck

  1. Anterior belly of digastric muscle develops in first branchial arch.
  2. Anterior ethmoidal artery accompanies naso-ciliary nerve.
  3. In tonsillitis, pain in the ear is due to involvement of glossopharyngeal (9) nerve.
  4. Most common site of CSF rhinorrhea is cribriform plate
  5. Tensor of vocal cords is cricothyroid muscle; it raises the pitch of the voice.
  6. Endolymphatic sac end between the two layers of the dura on the posterior surface of the petrous temporal bone near the sigmoid sinus (Skull).
  7. Maximum contribution to the floor of orbit is by the maxilla bone
  8. Scalp: The dense subcutaneous connective tissue layer has the richest cutaneous blood supply in the body.

Medial wall of the orbit has the following bones contributing:

  1. Principally by the orbital plate (lamina papyracea) of the ethmoid bone.
  2. The ethmoid articulates with the medial edge of the orbital plate of the frontal bone at a suture which is interrupted by anterior and posterior ethmoidal foramina.
  3. Posteriorly, it articulates with the body of the sphenoid, which forms the medial wall of the orbit to its apex.
  4. The lacrimal bone lies anterior to the ethmoid: it contains a fossa for the nasolacrimal sac that is limited in front by
  5. The anterior lacrimal crest on the frontal process of the maxilla
  6. Condyle is the commonest site of mandibular fractures.
  7. The triangular space between the medial border of scalenus anterior and the longus colli muscle contain the following structures – vertebral artery & vein, inferior thyroid artery, sympathetic trunk, inferior cervical ganglion, thoracic duct (left side).
  8. Intrinsic laryngeal muscles are supplied by the recurrent laryngeal nerve.
  9. Incudio-malleolar joint is a saddle variety of synovial joint.
  10. Secretomotor fibres to parotid salivary gland are supplied by the otic ganglion.
  11. Taste sensation from the circumvallate papillae, present on the anterior two third of tongue is carried by Glossopharyngeal nerve.
  12. Facial artery can be palpated at the anterior border of masseter.
  13. Oesophagus constrictions:

1. Pharyngoesophageal junction                              
2. Arch of aorta

3. Left main bronchus                                                
4. Diaphragm


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