Definition
(Typical intercostals space): The potential spaces
between two adjacent typical ribs are called typical intercostals spaces.
From 3rd to 8th intercostal
spaces are typical spaces, they extend from lateral sterna border to vertebral
column.
Boundaries:
1) Above:
Lower border of upper rib.
2) Below:
Upper border of lower rib.
3) Antero-medially:
Lateral border of sternum.
4) Posterior-medially:
Body of thoracic vertebra.
Content:
1) Muscles:
Outer to inner-
a) External
internal muscle.
b) Internal
intercostals muscle.
c) Innermost
intercostals muscle.
2) Vessels:
a) Anterior
intercostals vessels: Two in each space.
b) Posterior
intercostals space: One in each space.
3) Nerves:
Intercostal nerve (from 3rd to 8th ): One in each
corresponding space.
Arrangements
of structures:
1) Muscles:
Outer to inner-
a) External
intercostals muscle.
b) Internal
intercostals muscle.
c) Innermost
intercostals muscle.
2) Vessels
& Nerve: From above downwards:
a) Intercostal
vein.
b) Intercostal
artery.
c) Intercostal
nerve.
They lie in between the internal intercostals and
innermost intercostals muscle.
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