Longissimus (Capitis, Cervicis & Thoracis)

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Longissimus Captis

Origin: Transverse processes of T1-5. Articular processes of C5-7

Insertion: Posterior mastoid process of temporal bone.

Actions: When working bilaterally extends spine. When working independently laterally flexes vertebral column.

Innervation:Dorsal rami of spinal nerves.

Daily uses: Maintains upper back posture in sitting and standing.

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Longissimus Cervicis

Origin: Transverse processes of T1-5. 

Insertion: Transverse processes of C2-6.

Actions: When working bilaterally extends spine. When working independently laterally flexes vertebral column.

Innervation: Dorsal rami of spinal nerves.

Daily uses: Maintains posture in sitting and standing.

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Longissimus Thoracis

Origin: Lateral and medial sacral crests. L1-5 and T11-12 spinous processes and supraspinal ligament. Medial part of iliac crest.

Insertion: Transverse processes of T1-12. Area between tubercles and angles of lower nine or ten ribs.

Actions: When working bilaterally extends spine. When working independently laterally flexes vertebral column.

Innervation: Dorsal rami of spinal nerves.

Daily uses: Maintains posture in sitting and standing.

Other muscles …

Supraspinatus

Origin: Supraspinous fossa

Insertion: Greater tuberosity of the humerus

Actions: Abduction 
Stabilisation of the humerus

Innervation: Suprascapular nerve

Daily uses: Holding shopping bags away from the body

 

Teres Minor

Origin: Mid section of the lateral border of the scapula

Insertion: Greater tuberosity on the humerus

Actions:External rotation, 
Shoulder adduction

Innervation: Axillary nerve

Daily uses: Brushing hair

Subscapularis

Origin: Anterior (costal) surface of the scapula

Insertion: Lesser tuberosity of the humerus

Actions: Internal rotation
, Adduction

Innervation: Upper and lower subscapular nerves

Daily uses: Tucking the back of your shirt into your trousers

More Anatomy

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Ligaments

Check out strengthening exercises for the rotator cuff

 

 

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