Rectus Capitis Posterior Major: Difference between revisions
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== Description == | == Description == | ||
The fibers of | The fibers of the Rectus Capitis Posterior Major (RCPM) muscle skips C1 as it runs from C2 to the occiput, lateral to the [https://www.physio-pedia.com/Rectus_Capitis_Posterior_Minor rectus capitis posterior minor]. It is also known as the Greater Posterior Rectus Capitis, and comprises the posterosuperior boarder of the suboccipital triangle.<ref name="T&S">Travell JG, Simons DG, Simons LS (1998). Travell and Simons' Myofascial Pain and Dysfunction: The Trigger Point Manual, Volume 1: Upper Half of Body (2nd ed). Baltimore, MD: Williams & Wilkins.</ref> | ||
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== Origin == | == Origin == | ||
It arises from the tip of the spinous process of the axis (C2).<ref name="AE">http://www.anatomyexpert.com/structure_detail/5210/</ref> | |||
== Insertion == | == Insertion == | ||
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== Action == | == Action == | ||
* Bilateral contraction of rectus capitis posterior muscles contributes to extension of the head at the occipitoatlantal and atlantoaxial joints | |||
* Unilateral contraction of the RCPM muscles causes ipsilateral rotation and side bending of the head<ref>Hallgren RC, Pierce SJ, Sharma DB, Rowan JJ. [https://www.degruyter.com/document/doi/10.7556/jaoa.2017.004/html#j_jaoa.2017.004_ref_001 Forward head posture and activation of rectus capitis posterior muscles]. Journal of Osteopathic Medicine. 2017 Jan 1;117(1):24-31.</ref><ref>Agur AMR, Dalley AF (2012). Grant's Atlas of Anatomy (13th ed). Philadelphia, PA: Lippincott Williams & Wilkins.</ref> | |||
== Function == | == Function == | ||
Likely a postural muscle that monitors the position of the head.<ref name="AE" /> | Likely a postural muscle that monitors the position of the head.<ref name="AE" /> | ||
== Assessment == | |||
=== Palpation === | |||
This is the easiest suboccipital muscle to palpate. RCPM can be palpated between the spinous process of the axis (C2) and the occiput. This muscle can be palpated when all the subocciptal muscles are in a relaxed state.<ref>Chapter 12 Palpation of the Neck Muscles. The Muscle and Bone Palpation Manual Joseph E. Muscolino 3rd Edition</ref> | |||
* With the client supine and therapist seated at the head end of the plinth, therapist locates the spinous process of C2 | |||
* Then moves superolaterally to feel the RCPM fibres | |||
=== Power === | |||
=== Length === | |||
== Trigger Point Referral Pattern<ref name="T&S" /> == | == Trigger Point Referral Pattern<ref name="T&S" /> == |
Revision as of 15:14, 21 February 2024
Original Editor - Evan Thomas
Lead Editors - Evan Thomas, Vidya Acharya, Tarina van der Stockt, WikiSysop and Kim Jackson
Description[edit | edit source]
The fibers of the Rectus Capitis Posterior Major (RCPM) muscle skips C1 as it runs from C2 to the occiput, lateral to the rectus capitis posterior minor. It is also known as the Greater Posterior Rectus Capitis, and comprises the posterosuperior boarder of the suboccipital triangle.[1]
Origin[edit | edit source]
It arises from the tip of the spinous process of the axis (C2).[2]
Insertion[edit | edit source]
Lateral aspect of the inferior nuchal line of the occiput,[2] as well as to the bone inferior to this line.[1]
Nerve Supply[edit | edit source]
Suboccipital nerve or dorsal ramus of cervical spinal nerve (C1).[2]
Blood Supply[edit | edit source]
Vertebral artery and the deep descending branch of the occipital artery.[2]
Action[edit | edit source]
- Bilateral contraction of rectus capitis posterior muscles contributes to extension of the head at the occipitoatlantal and atlantoaxial joints
- Unilateral contraction of the RCPM muscles causes ipsilateral rotation and side bending of the head[3][4]
Function[edit | edit source]
Likely a postural muscle that monitors the position of the head.[2]
Assessment[edit | edit source]
Palpation[edit | edit source]
This is the easiest suboccipital muscle to palpate. RCPM can be palpated between the spinous process of the axis (C2) and the occiput. This muscle can be palpated when all the subocciptal muscles are in a relaxed state.[5]
- With the client supine and therapist seated at the head end of the plinth, therapist locates the spinous process of C2
- Then moves superolaterally to feel the RCPM fibres
Power[edit | edit source]
Length[edit | edit source]
Trigger Point Referral Pattern[1][edit | edit source]
References[edit | edit source]
- ↑ 1.0 1.1 1.2 Travell JG, Simons DG, Simons LS (1998). Travell and Simons' Myofascial Pain and Dysfunction: The Trigger Point Manual, Volume 1: Upper Half of Body (2nd ed). Baltimore, MD: Williams & Wilkins.
- ↑ 2.0 2.1 2.2 2.3 2.4 http://www.anatomyexpert.com/structure_detail/5210/
- ↑ Hallgren RC, Pierce SJ, Sharma DB, Rowan JJ. Forward head posture and activation of rectus capitis posterior muscles. Journal of Osteopathic Medicine. 2017 Jan 1;117(1):24-31.
- ↑ Agur AMR, Dalley AF (2012). Grant's Atlas of Anatomy (13th ed). Philadelphia, PA: Lippincott Williams & Wilkins.
- ↑ Chapter 12 Palpation of the Neck Muscles. The Muscle and Bone Palpation Manual Joseph E. Muscolino 3rd Edition