Serratus Posterior: Difference between revisions
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== Description == | == Description == | ||
Serratus posterior muscle consists of serratus posterior superior and serratus posterior inferior they are intermediate layer of back muscles | |||
=== Origin === | === Origin === | ||
[[File:Serratus posterior superior muscle back.png|thumb|217x217px|serratus posterior superior]] | |||
Serratus posterior superior: C7-T3 vertebrae spinous process and nuchal ligament | |||
Serratus posterior inferior: T11-L2 vertebrae spinous process | |||
[[File:Serratus posterior inferior muscle back2.png|thumb|219x219px|serratus posterior inferior]] | |||
=== Insertion === | === Insertion === | ||
It inserts into ribs | |||
Serratus posterior superior: at upper border of 2nd-5th ribs | |||
Serratus posterior inferior: at lower border of 9th-12th ribs | |||
=== Nerve === | === Nerve === | ||
Serratus posterior superior innervated by ventral rami of T1-T5. | |||
Serratus posterior inferior innervated by ventral rami of T9-T12. | |||
== Function == | == Function == | ||
Both serratus posterior superior and inferior are accessory muscles for respiration | |||
Serratus posterior superior: elevate the ribs during inspiration(accessory muscle of inspiration) and has a stabilization role for thorax. | |||
Serratus posterior inferior: depress the ribs during expiration(accessory muscle of expiration) | |||
Bilateral action of posterior superior/posterior inferior reduce extension of thoracic vertebrae. | |||
Unilateral action: rotate spine to opposite side. | |||
== Clinical relevance == | == Clinical relevance == | ||
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<references /> | <references /> | ||
[[Category:Anatomy]] [[Category:Muscles]] | [[Category:Anatomy]] | ||
[[Category:Muscles]] | |||
Revision as of 23:12, 10 March 2020
Original Editor -
Top Contributors - Khloud Shreif, Kim Jackson and Ahmed M Diab
Description[edit | edit source]
Serratus posterior muscle consists of serratus posterior superior and serratus posterior inferior they are intermediate layer of back muscles
Origin[edit | edit source]
Serratus posterior superior: C7-T3 vertebrae spinous process and nuchal ligament
Serratus posterior inferior: T11-L2 vertebrae spinous process
Insertion[edit | edit source]
It inserts into ribs
Serratus posterior superior: at upper border of 2nd-5th ribs
Serratus posterior inferior: at lower border of 9th-12th ribs
Nerve[edit | edit source]
Serratus posterior superior innervated by ventral rami of T1-T5.
Serratus posterior inferior innervated by ventral rami of T9-T12.
Function[edit | edit source]
Both serratus posterior superior and inferior are accessory muscles for respiration
Serratus posterior superior: elevate the ribs during inspiration(accessory muscle of inspiration) and has a stabilization role for thorax.
Serratus posterior inferior: depress the ribs during expiration(accessory muscle of expiration)
Bilateral action of posterior superior/posterior inferior reduce extension of thoracic vertebrae.
Unilateral action: rotate spine to opposite side.
