EXCEPTIONS REGARDING NERVE SUPPLY OF MUSCLES
- All the muscles of facial
expression are supplied by facial nerve except for "levator palpebrae
superiors" which is supplied by oculomotor nerve.
- All the muscles of eye except superior oblique and lateral rectus are supplied by oculomotor nerve. The superior oblique is supplied by 4th cranial or trochlear nerve [S04]. The lateral rectus is supplied by the 6th or abducent nerve LR6.
- All the muscles of tongue are supplied by hypoglossal nerve except for palatoglossus which is supplied by the cranial part of accessory nerve through the pharyngeal plexus.
- All the muscles of larynx are supplied by the recurrent laryngeal nerve except for cricothyroid (only intrinsic muscle lying on the external aspect of the larynx) which is supplied by the external laryngeal nerve.
- All the muscles of pharynx are supplied by the cranial accessory nerve through branches of vagus except the stylopharyngeus, which is supplied by the glossopharyngeal nerve.
- All the muscles of the soft palate are supplied by the cranial accessory nerve through vagal branches except for tensor palati which is supplied by the mandibular nerve.
- All the muscles of mastication are supplied by the anterior trunk of mandibular nerve(through masseteric and deep temporal nerve) except for the medial pterygoid, which is supplied by "nerve to medial pterygoid", a branch of main trunk of mandibular nerve,
- All the infrahyoid muscles are supplied by ansa cervicalis (formed by superior and inferior roots. The superior root of continuation of the descending branch of the hypoglossal nerve and its fibres are derived from the first cervical nerve. The inferior root is derived from spinal nerves (C2 and C3) except for thyrohyoid, which are nerves and except for thyrohyoid, which is supplied by C1 through hypoglossal nerve.
