The Ectodermal Derivatives  Document Sample The Ectodermal
Derivatives Powered By Docstoc
Divided into:            The Ear  External (outer) ear Consists
of :  Auricle or pinna  External auditory   canal (external
auditory meatus,   external acoustic  Middle ear  Internal ear
It is the outer expanded portion of the ear, projects from the
Helix                                                 External
auditory meatus  side of the head Serves to collect the
vibrations   Antihelix                 Tragus  of the air by
which sound is           Concha Consists of a thin plate of
elastic cartilage covered by The skin is continuous with that
Auricular lining the external acoustic
muscles  Possesses both extrinsic and intrinsic muscles, which
are supplied by the facial nerve Arteries :   Posterior
auricular artery, branch of the external    carotid artery  
Anterior auricular artery, branch of the superficial    temporal
artery   Auric