Pectoralis minor muscle
Citation, DOI, disclosures and article data
Citation:
Knipe H, Yu Y, Hacking C, et al. Pectoralis minor muscle. Reference article, Radiopaedia.org (Accessed on 28 Sep 2023) https://doi.org/10.53347/rID-23254
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rID:
23254
Article created:
Disclosures:
At the time the article was created Henry Knipe had no recorded disclosures.
View Henry Knipe's current disclosuresLast revised:
Disclosures:
At the time the article was last revised Henry Knipe had the following disclosures:
- Integral Diagnostics, Shareholder (ongoing)
- Micro-X Ltd, Shareholder (ongoing)
These were assessed during peer review and were determined to not be relevant to the changes that were made.
View Henry Knipe's current disclosuresRevisions:
16 times, by 10 contributors - see full revision history and disclosures
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Sections:
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Synonyms:
- Pectoralis minor muscle
- Pec minor muscle
The pectoralis minor muscle is a muscle of the pectoral region lying deep to and completely covered by the pectoralis major muscle.
It is an important anatomical landmark in two senses:
it arbitrarily divides the axillary artery into 3 parts
it arbitrarily divides the axillary lymph nodes into 3 levels
Summary
origin: anterior 3rd-5th ribs near the costal cartilages
insertion: medial and upper aspect of the coracoid process of the scapula
innervation: medial and lateral pectoral nerves
arterial supply: thoracoacromial, superior thoracic and lateral thoracic arteries
-
action
depresses and protracts shoulder
when scapula fixed, elevation of 3rd-5th ribs
Variant anatomy
pre-fixed origin: ribs 2-4
post-fixed origin: ribs 4-6
absence: seen in Poland syndrome
Quiz questions
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References
- 1. Schuenke M, Schulte E, Schumacher U et-al. General Anatomy and Musculoskeletal System. Thieme. (2010) ISBN:1604062924. Read it at Google Books - Find it at Amazon
- 2. Last's anatomy, regional and applied. Churchill Livingstone. ISBN:044304662X. Read it at Google Books - Find it at Amazon
- 3. Moore KL, Agur AMR, Dalley AF. Clinically oriented anatomy. LWW. ISBN:1451119453. Read it at Google Books - Find it at Amazon
- 4. Standring S, & Gray H, (2008). Gray's anatomy: The anatomical basis of clinical practice. Edinburgh: Churchill Livingstone/Elsevier
Related articles: Anatomy: Upper limb
-
skeleton of the upper limb
- clavicle
- scapula
- humerus
- radius
- ulna
- hand
- accessory ossicles of the upper limb
- accessory ossicles of the shoulder
- accessory ossicles of the elbow
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accessory ossicles of the wrist (mnemonic)
- os centrale carpi
- os epilunate
- os epitriquetrum
- os styloideum
- os hamuli proprium
- lunula
- os triangulare
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pectoral girdle
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shoulder joint
- articulations
- associated structures
- joint capsule
- bursae
- ligaments
- movements
- scapulothoracic joint
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glenohumeral joint
- arm flexion
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shoulder joint
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elbow joint
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wrist joint
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ligaments
- intrinsic ligaments
- extrinsic ligaments
- radioscaphoid ligament
- dorsal intercarpal ligament
- dorsal radiotriquetral ligament
- dorsal radioulnar ligament
- volar radioulnar ligament
- radioscaphocapitate ligament
- long radiolunate ligament
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- short radiolunate ligament
- ulnolunate ligament
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- associated structures
- extensor retinaculum
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- joint capsule
- movements
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hand joints
- articulations
- carpometacarpal joint
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metacarpophalangeal joints
- palmar ligament (plate)
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interphalangeal joints
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pectoral girdle
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anterior compartment of the forearm
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posterior compartment of the forearm (extensors)
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accessory muscles
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- volar wrist ulnar-side
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arteries
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- veins
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arteries
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brachial plexus (mnemonic)
- branches from the roots
- branches from the trunks
- branches from the cords
- lateral cord
- posterior cord
- medial cord
- terminal branches
- lymphatic drainage of the upper limb
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