L15 Muscles evolution

L15 Muscles evolution - Axial muscles, evolution Almost all...

Info iconThis preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
Axial muscles, evolution
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
Almost all verts have these 6 extrinsic ocular muscles
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Innervation • ventral oblique, ventral rectus, medial rectus, dorsal rectus innervated by CN III = occulomotor • dorsal oblique innervated by CN IV = trochlear lateral rectus innervated by CN VI = abducens Some tetrapods have retractor bulbi (occulomotor) Birds have levator palpebrae superioris, depressor palpebrae inferioris (occulomotor) Mammals only have superioris
Background image of page 4
Why??? Ocular muscles come from a variety of sources I II eye
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 6
adductor mandibulae levator palatoquadratae spiracularis preorbitalis intermandibularis
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Muscles from brachiomere 1 (mandibular) – innervated by trigeminal nerve (Vth CN) Associated with jaw closing in gnathostomes 1 adductor mandibulae – huge – closes jaw (palato to Meckel) 2 levator palatoquadrati – lifts palatoquadrate during prey capture (otic cap to palato) 3 spiracularis - controls spiracle (otic cap to palato) 4 preorbitalis – closes jaw (chondrocran to Meckel) 5 intermandibularis – constricts throat (Meckel to mid vent)
Background image of page 8
Image of page 9
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 25

L15 Muscles evolution - Axial muscles, evolution Almost all...

This preview shows document pages 1 - 9. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online