Term
| Muscle: External Intercostal Muscles |
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Definition
Origin: Inferior surfaces of ribs 1-11
Course: Down and obliquely out
Insertion: Upper surface of rib immediately below
Innervation: Intercostal Nerves
Function: Elevate the rib |
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Term
| Muscle: Internal Intercostal Muscles, Interchondral Portion |
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Definition
Origin: Inferior margin of ribs 1-11
Course: Down and lateral
Insertion: Superior surface of the rib below
Innervation: Intercostal Nerves
Function: Elevate ribs 1-11 |
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Term
| Muscle: Levator costarum, brevis |
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Definition
Origin: Transverse process of vertebrae C7-T11
Course: Obliquely down and out
Insertion: Tubercle of the rib below
Innervation: Intercostal nerves
Function: Elevates rib cage |
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Term
| Muscle: Levator costarum, longis |
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Definition
Origin: Transverse process of T7-T11
Course: Down and obliquely out
Insertion: Bypass the rib below inserting into the next rib
Innervation: Intercostal nerves
Function: Elevates the rib cage |
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Term
| Muscle: Serratus posterior superior |
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Definition
Origin: Spinous processes of C7 and T1-T3
Course: Down and laterally
Insertion: just beyond the angles of ribs 2-5
Innervation: Ventral intercostal portion
Function: Elevates ribs 2-5 |
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Term
| Muscle: Iliocostalis lumborum |
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Definition
Origin: Sacral crest, L1-L5, T11-T12
Course: Up
Insertion: Ribs 6-12
Innervation: Dorsal Rami
Function: Stabilize and move vertebral column |
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Term
| Muscle: Sternocleidomastoid |
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Definition
Origin: Mastoid process of the temporal bone
Course: Down
Insertion: Superior manubrium sterni, clavicle
Innervation: 11th accessory nerve
Function: Elevates the sternum and rib cage |
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Term
| Muscle: Scalenus Anterior |
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Definition
Origin: Transverse Process of vertebrae C3-C6
Course: Down
Insertion: Superior surface of rib 1
Innervation: C4-C6
Function: Elevates rib 1 |
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Term
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Definition
Origin: Transverse process of vertebrae C2-C7
Course: Down
Insertion: Superior surface of the first rib
Innervation: Cervical plexus
Function: Elevates rib 1 |
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Term
| Muscle: Scalenus Posterior |
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Definition
Origin: Transverse process of C5-C7
Course: Down
Insertion: Second rib
Innervation: Spinal nerves C5-C8
Function: Elevates rib 2 |
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Term
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Definition
Origin: Sternal head: length of the sternum at costal cartilages; clavicular head: anterior clavicle
Course: Fans laterally, converging at the humerus
Insertion: Humerus
Innervation: Brachial plexus
Function: Elevates the sternum |
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Term
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Definition
Origin: Anterior surface of ribs 2-5 near the chondral margin
Course: Up and laterally
Insertion: Scapula
Innervation: Brachial Plexus
Function: Increases transverse dimension of rib cage |
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Term
| Muscle: Serratus Anterior |
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Definition
Origin: Ribs 1-9
Course: Up and back
Insertion: Inner vertebral border of scapula
Innervation: Brachial Plexus
Function: Elevates ribs 1-9 |
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Term
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Definition
Origin: Inferior surface of the clavicle
Course: Oblique and medial
Insertion: Superior surface of rib 1 at chondral margin
Innervation: Brachial Plexus
Function: Elevates rib 1 |
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Term
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Definition
Origin: Transverse process of C1-C4
Course: Down
Insertion: Medial border of scapula
Innervation: Cervical Plexus
Function: Neck support, elevates scapula |
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Term
| Muscle: Rhomboideus Major |
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Definition
Origin: Spinous process of T2-T5
Course: Down and laterally in
Insertion: Scapula
Innervation: Spinal C5
Function: Stabilizes the shoulder girdle |
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Term
| Muscle: Rhomboideus Minor |
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Definition
Origin: Spinous process of C7 and T1
Course: Down and laterally in
Insertion: Scapula
Innervation: Spinal C5
Function: Stabilizes the shoulder girdle |
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Term
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Definition
Origin: Spinous process of C2-T12
Course: Fans laterally
Insertion: Scapula and clavicle
Innervation: 11th accessory
Function: Elongates neck, controls head |
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