Trunk Muscles Flashcards
Trapezius
Origin: occipital protuberance, ligamentum nuchae, spinous process
Insertion: spine of scapula, acromion, clavicle
Motions: rotational component
Upper fibers- Elevation, rotational elevation
middle fibers: retraction, stabilize scapula
Lower fibers- Depression, rotational elevation
Nerve: Accessory
Latissimus Dorsi
Origin: inferior angle of scapula, spinous process of last 6 thoracic vertebrae, last 3 or 4 ribs, thoracolumbar aponeurosis and posterior iliac crest
Insertion: intertubercular groove of the humerus
Motions: adduction(prime mover), extension, medial rotation
Nerve: Thoracodorsal nerve
Rhomboid Minor
Origin: spinous process c7-t1
Insertion:upper portion of medial border of scapula
Motions: Elevation, retraction, rotational depression
Rhomboid major
Origin: spinous process of T2-T5
Insertion: medial border of scapula
Motions: Elevation, retraction, rotational depression
Levator Scapula
Origin: upper cervical vertebrae
Insertion: medial border of scapula
Motions: Elevation, rotational depression
Deltoid
Origin: Parts of outer clavicle
Insertion: Deltoid tuberosity
Motions:
All fibers: abduction (prime mover)
Anterior fibers: Flexion
Posterior fibers: Extension, external rotation
Nerve: Axillary nerve
Serratus Posterior Superior
Action:
Elevate Ribs during Inhalation
Nerve:
T1, 2, 3, 4
Serratus Posterior Inferior
Action:
Depress Ribs during Exhalation
Nerve:
T9, 10, 11, (12)
Splenius Capitis
Action:
Unilaterally:
Rotate Head/Neck to Same Side
Laterally Flex Head/Neck to Same Side
Bilaterally:
Extend Head/Neck
Nerve:
Cervical Nerve
Splenius Cervicis
Action:
Unilaterally:
Rotate Head/Neck to Same Side
Laterally Flex Head/Neck to Same Side
Bilaterally:
Extend Head/Neck
Nerve:
Cervical Nerve
Erector Spinae- iliocostalis
Action:
Unilaterally:
Laterally Flex Vertebral Column to Same Side
Bilaterally:
Extend Vertebral Column
Nerve:
Spinal
Erector Spinae- Longissimus
Action:
Unilaterally:
Laterally Flex Vertebral Column to Same Side
Bilaterally:
Extend Vertebral Column
Nerve:
Spinal
Erector Spinae- Spinalis
Action:
Unilaterally:
Laterally Flex Vertebral Column to Same Side
Bilaterally:
Extend Vertebral Column
Nerve:
Spinal Nerve
Multifidi
Action:
Unilaterally:
Rotate Vertebral Column to Opposite Side
Bilaterally:
Extend Vertebral Column
Nerve:
Spinal Nerve
Rotators
Action:
Unilaterally:
Rotate Vertebral Column to Opposite Side
Bilaterally:
Extend Vertebral Column
Nerve:
Spinal Nerve
Interspinalis
Action:
Extend Vertebral Column
Nerve:
Spinal Nerve
Intertransversarii
Action:
Unilaterally:
Laterally Flex Vertebral Column to Same Side
Bilaterally:
Extend Vertebral Column
Nerve:
Spinal Nerve
Levator Costalis (Costarum?)
Action:
Elevate ribs for deep inspiration
Nerve:
dorsal rami
External Oblique
Action:
Unilaterally:
Laterally Flex Vertebral Column to Same Side
(Right Side: Lumbar Lateral Flexion to Right)
(Left Side: Lumbar Lateral Flexion to Left)
Rotate Vertebral Column to Opposite Side
(Right Side:Rotation to Left)
(Left Side: Rotation to Right)
Bilaterally:
Flex the Vertebral Column
Compress Abdominal Contents
Nerve: (T5,6) t7-11, T12
Iliohypogastric and Ilioinguinal
Ventral primary rami
Internal Oblique
Action:
Unilaterally:
Laterally Flex Vertebral Column to Same Side
(Right Side: Lumbar Lateral Flexion to Right)
(Left Side: Lumbar Lateral Flexion to Left)
Rotate Vertebral Column to Same Side
(Right Side:Rotation to Right)
(Left Side: Rotation to Left)
Bilaterally:
Flex the Vertebral Column
Compress Abdominal Contents
Nerve: T7,8, T9-12, L1
Iliohypogastric and Ilioinguinal
Ventral primary rami
Rectus Abdominis
Action:
Unilaterally:
Laterally Flex Vertebral Column to Same Side
(Right Side: Lumbar Lateral Flexion to Right)
(Left Side: Lumbar Lateral Flexion to Left)
Bilaterally:
Flex the Vertebral Column
Tilt Pelvis Posteriorly
Nerve: T5, T7-11, T12, ventral rami
Transverse Abdominis
Action:
Forced expiration by pulling the abdominal wall inward
(Compress Abdominal Contents)
Nerve: T7-12, L1
Iliohypogastric and Ilioinguinal
Ventral divisions
Internal Intercostals
Action:
Draw Ribs Inferiorly to Assist with Exhalation
(Decreases Space of Thoracic Cavity)
Nerve:
Thoracic Nerve
External Intercostals
Action:
Draw Ribs Superiorly to Assist with Inhalation
(Increases Space of Thoracic Cavity)
Nerve:
Thoracic Nerve
Quadratus Lumborum
Unilaterally:
Laterally Tilt(Elevate) Pelvis
Laterally Flex Vertebral Column to Same Side
Extend Vertebral Column(Assist)
Bilaterally:
Fix Last Rib During Forced Inhalation and Exhalation
Stabilize Pelvis and Lumbar Spine
Nerve:
Lumbar Plexus Nerve
