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Function and Innervation of the Back Muscles
UCF Anatomy
28
Anatomy
Undergraduate 3
05/20/2009
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Term
Trapezius
 Definition
  • Function: Elevation, retraction, and rotation.
  • Innervation: Spinal root of Accessory nerve (CNXI) and C3-C4 (propioception and pain)
Term
Rhomboid Major and Minor
 Definition
  • Function: press the scapula to the thoracic wall, retraction of scapula medially.
  • Dorsal Scapular Nerve (C4-C5)
Term
Levator Scapulae
 Definition
  • Function: Elevates the Scapula.
  • Innervation: Dorsal Scapular Nerve (C4-C5)
Term
Latissimus Dorsi
 Definition
  • Function: Adduction and lowering the arm, medial rotation and extension of the arm (humerous). Raises the body toward the arm when climbing.
  • Innervation: Thoracodorsal Nerve (C6, C7,C8)
Term
Serratus Posterior Inferior
 Definition
  • Function: Accessory muscle of respiarion.
  • Innervation: Intercostal Nerves (T9-T12)
Term
Serratus Posterior Superior
 Definition
  • Function: Rib Elevation
  • Innervation: Intercostal Nerves (T2-T5)
Term
Erector Spinae Muscles
 Definition
  • Lateral Group: Iliocostalis lumborum, thoracis, and cervicis; Longissimus thoracis, cervicis, and capitis; Splenius cervicis and capitis.
  • Medial Group: Interspinales muscles; Intertransverse cervicis and lumbar; Spinalis thoracis, cervicis, and capitis; Rotator brevis; Longus thoracis; Multifundus; Semispinalis cervicis and capitis.  
Term
Iliocostalis lumborum
 Definition
  • Function: Erect posture of the body. Extensors when both sides contract and flexion when one side contracts.
  • Innervation: Primary spinal doersal rami.
Term
Iliocostalis thoracis
 Definition
  • Function: Erect posture of the body. Extensors when both sides contract and flexion when one side contracts.
  • Innervation: Primary spinal doersal rami.
Term
Iliocostalis cervicis
 Definition
  • Function: Erect posture of the body. Extensors when both sides contract and flexion when one side contracts.
  • Innervation: Primary spinal doersal rami.
Term
Longissimus thoracis
 Definition
  • Function: Erect posture of the body. Extensors when both sides contract and flexion when one side contracts.
  • Innervation: Primary spinal doersal rami.
Term
Longissimus cervicis
 Definition
  • Function: Erect posture of the body. Extensors when both sides contract and flexion when one side contracts.
  • Innervation: Primary spinal doersal rami.
Term
Longissimus capitis
 Definition
  • Function: Erect posture of the body. Extensors when both sides contract and flexion when one side contracts.
  • Innervation: Primary spinal doersal rami.
Term
Splenius cervicis
 Definition
  • Function: Erect posture of the body. The splenii rotate the head.Extensors when both sides contract and flexion when one side contracts.
  • Innervation: Primary spinal doersal rami.
Term
Splenius capitis
 Definition
  • Function: Erect posture of the body. The splenii rotate the head.Extensors when both sides contract and flexion when one side contracts.
  • Innervation: Primary spinal doersal rami.
Term
Interspinales muscles
 Definition
  • Function: Extensors when both sides contract and flexion when one side contracts. Some stabilize and some rotate the vertebral column.
  • Innervation: Various primary dorsal rami.
Term
Intertransverse cervicis
 Definition
  • Function: Extensors when both sides contract and flexion when one side contracts. Some stabilize and some rotate the vertebral column.
  • Innervation: Various primary dorsal rami.
    		•
    Term
    Intertransverse lumbar
    		 Definition
  • Function: Extensors when both sides contract and flexion when one side contracts. Some stabilize and some rotate the vertebral column.
  • Innervation: Various primary dorsal rami.
    		•
    Term
    Spinalis thoracis
    		 Definition
  • Function: Extensors when both sides contract and flexion when one side contracts. Some stabilize and some rotate the vertebral column.
  • Innervation: Various primary dorsal rami.
    		•
    Term
    Spinalis cervicis
    		 Definition
  • Function: Extensors when both sides contract and flexion when one side contracts. Some stabilize and some rotate the vertebral column.
  • Innervation: Various primary dorsal rami.
    		•
    Term
    Spinalis capitis
    		 Definition
  • Function: Extensors when both sides contract and flexion when one side contracts. Some stabilize and some rotate the vertebral column.
  • Innervation: Various primary dorsal rami.
    		•
    Term
    Rotator brevis
    		 Definition
  • Function: Extensors when both sides contract and flexion when one side contracts. Some stabilize and some rotate the vertebral column.
  • Innervation: Various primary dorsal rami.
    		•
    Term
    Longus thoracis
    		 Definition
  • Function: Extensors when both sides contract and flexion when one side contracts. Some stabilize and some rotate the vertebral column.
  • Innervation: Various primary dorsal rami.
    		•
    Term
    Multifundus
    		 Definition
  • Function: Extensors when both sides contract and flexion when one side contracts. Some stabilize and some rotate the vertebral column.
  • Innervation: Various primary dorsal rami.
    		•
    Term
    Semispinalis cervicis
    		 Definition
  • Function: Extensors when both sides contract and flexion when one side contracts. Some stabilize and some rotate the vertebral column.
  • Innervation: Various primary dorsal rami.
    		•
    Term
    Semispinalis capitis
    		 Definition
  • Function: Extensors when both sides contract and flexion when one side contracts. Some stabilize and some rotate the vertebral column.
  • Innervation: Various primary dorsal rami.
    		•
    Term
    Suboccipital Triangle
    		 Definition
    • Very Deep
    • Rectus capitis posterior major;Obliquus capitis superior;Obliquus capitis inferior
    • Content: 3rd part of vertebral artery; Suboccipital nerve (C1) innervating all 3 muscles; Suboccipital plexus of veins
    • Function: turning the head backward or laterally
    • Innervation: Sensory - Greater occipital nerve (C2)
    Term
    Vertebrobasilar Syndrome
    		 Definition
    • Blood supply to the brain is dimmished causing fainting.
    • Elderly people have a decreased blood supply thus increasing chances of fainting. Using anaesthesia during surgery increases chances of irregular circulation and possible death.
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