Middle ear bones

Question 1

How many bones are there

Answer 1

3

Question 2

What are the three bones

Answer 2

Malleus, Incus and Stapes

Question 3

What are some good uses of these bones

Answer 3

They preserve very well, are full size at birth, can be sexually dimorphic and can be used for dna

Question 4

How would you identify the malleus

Answer 4

The malleus has a round head and a diagonal projecting point known as the handle

Question 5

How would you side the malleus

Answer 5

Most of the time they are directly taken from their side but if not, lay the bone down with the head away from you and the facet up the process on top of the handle points towards its side the the bottom of the handle is opposite

Question 6

How would you identify the Incus

Answer 6

This is the mini pubis looking one, squarer body with inferior projection

Question 7

How would you side the Incus

Answer 7

Most of the time they are directly taken from their side but if not, hold the bone with the facet towards you and the longest point facing down. the long process bends towards its side at the top and again at the very bottom point

Question 8

How would you identify the stapes

Answer 8

This is the smallest one and is a horseshoe shape

Question 9

How would you side the stapes

Answer 9

Most of the time they are directly taken from their side but if not, the longer more curved side is posterior whereas the shorter straighter one is anterior