ACTIVITY 2

PUNTANAR, Aira Marie R._Activity 2

PUNTANAR, Aira Marie R._Activity 2

by Aira Marie Puntanar -
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Name at least three muscles that contracts during the following activities and name its action

and innervation:

Turning a door knob

  1. Supinator 

    • Action: Supinates forearm at radioulnar joints

    • Innervation: Deep radial nerve

  2. Pronator Teres 

    • Action: Pronates forearm at radioulnar joints; weakly flexes forearm at elbow joint

    • Innervation: Median nerve

  3. Pronator Quadratus 

    1. Action: Pronates forearm at radioulnar joints

    2. Innervation: Median nerve

Throwing a baseball overhead

  1. Deltoid

    • Action: Abduct arm at shoulder joint (lateral fibers), flex and medially rotate arm at shoulder joint (anterior fibers), extend and laterally rotate arm at shoulder joint (posterior fibers)

    • Innervation: Axillary nerve

  2. Subscapularis

    • Action: Medially rotates arm at shoulder joint

    • Innervation: Upper and lower subscapular nerve

  3. Latissimus Dorsi

    • Action: Extends, adducts, and medially rotates arm at shoulder joint; draws arm inferiorly and posteriorly; elevates vertebral column and torso (RMA)

    • Innervation: Thoracodorsal nerve

Kicking a ball

  1. Iliopsoas

    • Action: Flexes thigh at hip joint, rotates thigh laterally, flexes trunk on hip

    • Innervation: Lumbar spinal nerves L2=L3

  2. Rectus femoris 

    • Action: Extends leg at knee joint, flexes thigh at hip joint

    • Innervation: Femoral nerve

  3. Biceps femoris

    • Action: Flexes leg at knee joint, extends thigh at hip joint

    • Innervation: Tibial and femoral nerve from sciatic nerve

Doing sit-ups

  1. Rectus abdominis

    • Action: Flexes vertebral column, especially lumbar portion; compresses abdomen to aid in defecation, urination, forced exhalation, childbirth; flexes pelvis on the vertebral column (RMA) 

    • Innervation: Thoracic Spinal nerves (T7-T12)

  2. Transversus Abdominis

    • Action: Compresses abdomen

    • Innervation: Thoracic spinal nerves T8-T12, iliohypogastric nerve, ilioinguinal nerve

  3. Internal obliques

    • Action: Compresses abdomen and flexes vertebral column (acting together); laterally flex vertebral column, especially lumbar portion, rotates vertebral column (acting singly)

    • Innervation: Thoracic spinal nerves T8-T12,  iliohypogastric nerve, ilioinguinal nerve

Walking

  1. Gastrocnemius 

    • Action: Plantar flexes foot at ankle joint, flexes leg at knee joint

    • Innervation: Tibial nerve

  2. Soleus

    1. Action: Plantar flexes foot at ankle joint

    2. Innervation: Tibial nerve

  3. Quadriceps

    1. Action: Extends leg at knee joint

    2. Innervation: Femoral nerve

Breathing

  1. Diaphragm

    • Action: contraction of diaphragm - flattens and increases vertical dimensions of thoracic activity (inhalation); relaxation of diaphragm - move superiorly and decreases vertical dimension of thoracic activity (exhalation)

    • Innervation: Phrenic nerve (containing axons from cervical spinal nerves C3-C5 )

  2. External Intercostals

    • Action: contraction - elevates ribs and increases anteroposterior and lateral dimensions of thoracic cavity (inhalation); relaxation - depresses ribs and decreases anteroposterior and lateral dimensions of thoracic cavity (exhalation)

    • Innervation: Thoracic spinal nerves (T2-T12)

  3. Internal intercostals

    • Action: Contraction - draws adjacent ribs together to further decrease anteroposterior and lateral dimensions of thoracic cavity during forced exhalation

    • Innervation: Thoracic spinal nerves (T2-T12)

Reference:

Tortora, G. & Derrickson, B.(2012). Principles of anatomy and physiology. John Wiley & Sons