Muscle Manual Flashcards
(62 cards)
Levator Costarum
Part of the Minor Deep Layer of Back Muscles
Runs from transverse processes of the vertebrae to the rib below
Elevates the Ribs
External Intercostals
PA: Ribs - Inferior border
DA: Ribs below - superior border
Innervation: Intercostal nerves
Action: Approximation of the ribs
Internal Intercostals
PA: Ribs - Inferior border
DA: Ribs below - superior border
Innervation: Intercostal nerves
Action: Approximation of the ribs
Innermost Intercostals
PA: Ribs - Inferior border
DA: Ribs below - superior border
Innervation: Intercostal nerves
Action: Approximation of the ribs
Transversus Thoracis
PA: Sternum - Posterior Surface
DA: Ribs 2-6 Internal surface of Costal cartilages
Innervation: Intercostal nerves
Action: Proprioception; weakly depress the ribs
Subcostals
PA: Lower Ribs - Internal surface near angles
DA: Ribs 2 or 3 below - superior border
Innervation: Intercostal nerves
Action: similar to internal intercostal
Diaphragm
Central Attachment: Central Tendon
Peripheral Attachment:
Sternal –> Sternum - Xiphoid process
Costal –> Ribs 7-12 - Costal cartilages and adjacent
areas
Lumbar –> Arcuate Ligaments; LV1 - LV3
Innervation: Phrenic Nerve (C3 - C5)
Action: Depression (Increases the Thoracic Volume and Decreases the abdominal volume)
External Oblique
Origin: Ribs 5-12
Insertion:
Linea Alba
Pubis - Pubic Tubercle
Ilium - Iliac Crest
Innervation: Ventral Rami of Inferior 6 Thoracic Spinal Nerves
Action:
Unilateral - Trunk contralateral rotation
Bilateral - Trunk Flexion
Compress and support the abdominal viscera
Internal Oblique
Origin:
Thoracolumbar Fascia
ilium - Iliac Crest
Inguinal Ligament
Insertion:
Ribs 10 - 12
Linea Alba
Pubis - Pecten via conjoint tendon
Innervation: Ventral Rami of inferior 6 thoracic spinal nerves
Action:
Unilateral - Trunk ipsilateral rotation
Bilateral - Trunk Flexion
Compress and Support the Abdominal Viscera
Transverse Abdominal
Origin: Ribs 7-12 - Costal Cartilages Thoracolumbar Fascia Ilium - Iliac Crest Inguinal Ligament
Insertion:
Linea Alba
Pubis - Pubic Crest; Pecten Via Conjoint Tendon
Innervation: Ventral Rami of Inferior 6 Thoracic Spinal Nerves
Action: Compress and Support the abdominal viscera
Rectus Abdominis
Origin: Pubis - Symphysis; Crest
Insertion:
Sternum - Xiphoid Process
Ribs 5-7 - Costal Cartilages
Innervation: Ventral Rami of Inferior 6 Thoracic Spinal Nerves
Action:
Trunk Flexion
Compress and Support the Abdominal Viscera
Quadratus Lumborum
Superior Attachment:
Lumbar Vertebrae - Transverse Processes
Rib 12 - Medial, Inferior border
Inferior Attachment:
Iliolumbar Ligament
Ilium - Iliac Crest
Innervation: Ventral Rami of T12, L1 - L4 Spinal Nerves
Action:
Unilateral - Trunk Lateral Flexion
Bilateral - Trunk Extension; depress and stabilize the 12th rib
Levator Ani
3 Parts: Pubococcygeous, Puborectalis, Iliococcygeous
Innervation:
Nerve to levator Ani (S4)
Inferior Anal (Rectal) Nerve
Coccygeal Plexus
Action:
Helps Support the Pelvic Viscera
Resists Increases in Intra-Abdominal Pressure
Coccygeus
Aka Ischiococcygeus
Innervation: Branches of S4 and S5 Spinal nerves
Action:
Coccygeal Flexion
Helps support the pelvic viscera
Platysma
Superior Attachment:
Mandible - Inferior Border
Lower Face - Skin and subcutaneous Tissue
Inferior Attachment:
Fascia covering Superior Parts of Pectoralis Major and Deltoid Muscles
Innervation:
Cervical Branch of CNVII - Facial Nerve
Action:
Draws the corners of the mouth inferiorly and widens it
Draws the skin of the neck superiorly when the teeth are clenched
Sternocleidomastoid
Superior Attachment:
Temporal Bone - Mastoid Process
Occipital Bone - Superior Nuchal Line
Inferior Attachment:
Sternal Head –> Sternum - anterior surface of manubrium
Clavicular Head –> Clavicle - Medial superior surface
Innervation:
CNXI Spinal Accessory Nerve
Action:
Unilateral - Head lateral flexion with contralateral rotation
Bilateral - Head Extension and neck flexion
Mylohyoid
Suprahyoid Muscle
Innervation:
Mylohyoid Nerve - Branch of inferior alveolar nerve of CNV3 (Trigeminal Nerve, mandibular division)
Action:
Elevates the hyoid bone, Floor of the Mouth, and Tongue During Swallowing and Speaking
Geniohyoid
Suprahyoid Muscle
Innervation:
C1 via CNXII (Hypoglossal Nerve)
Action:
Pulls the hyoid bone anterosuperiorly
Shortens the gloor of the mouth
widens the pharynx
Stylohyoid
Suprahyoid Muscle
Innervation:
Sylohyoid Branch of CNVII (Facial Nerve)
Action:
Elevates and retracts the hyoid bone thereby elongating the floor of the mouth
Digastric
Suprahyoid Muscle
Innervation:
Anterior Belly - Mylohyoid Nerve - Branch of inferior alveolar nerve of CNV3 (Trigeminal Nerve, mandibular division)
Posterior Belly - Digastric Branch of CNVII (Facial Nerve)
Action:
Depresses the Mandible
Elevates and steadies the hyoid bone during swallowing and speaking
Sternohyoid
Infrahyoid Muscle
Innervation:
C1 - C3 via a Branch of Ansa Cervicalis
Action:
Depresses the Hyoid Bone After Elevation During Swallowing
Omohyoid
Infrahyoid Muscle
Innervation:
C1 - C3 via a branch of Ansa Cervicalis
Action:
Depresses, retracts, and steadies the hyoid bone
Sternothyroid
Infrahyoid Muscle
Innervation:
C2 - C3 via a branch of ansa cervicalis
Action:
Depresses hyoid bone and larynx
Thyrohyoid
Infrahyoid Muscle
Innervation:
C1 via CNXII - Hypoglossal nerve
Action:
Depresses Hyoid Bone
Elevates Larynx
