ACTIVITY 2

GUTIERREZ, Jamie Rafaella [Act. 2]

GUTIERREZ, Jamie Rafaella [Act. 2]

by Jamie Rafaella Gutierrez -
Number of replies: 0

  1. Throwing a baseball overhead 

    1. Muscle: Pectoralis major

      1. Action: As a whole, adducts and medially rotates arm at shoulder joint; clavicular head flexes arm, and sternocostal head extends flexed arm to side of trunk.

      2. Innervation: Medial and lateral pectoral nerves

    2. Muscle: Deltoid

      1. Action: Lateral fibers abduct arm at shoulder joint; anterior fibers flex and medially rotate arm at shoulder joint; posterior fibers extend and laterally rotate arm at shoulder joint.

      2. Innervation: Axillary nerve.

  2. Kicking a ball 

    1. Muscle: Gluteus medius

      1. Action: Abducts thigh at hip joint and medially rotates thigh.

      2. Innervation: Superior gluteal nerve.

    2. Muscle: Gluteus minimus

      1. Action: Abducts thigh at hip joint and medially rotates thigh.

      2. Innervation: Superior gluteal nerve.

  3. Doing sit-ups

    1. Muscle: Rectus abdominis

      1. Action: Flexes vertebral column, especially lumbar portion, and compresses abdomen to aid in defecation, urination, forced exhalation, and childbirth. RMA: Flexes pelvis on the vertebral column.

      2. Innervation: Thoracic spinal nerves T7–T12.

    2. Muscle: Transversus abdominis

      1. Action: Compresses abdomen.

      2. Innervation: Thoracic spinal nerves T8–T12, iliohypogastric nerve, and ilioinguinal nerve.

  4. Breathing 

    1. Muscle: External intercostals

      1. Action: Contraction elevates ribs and increases anteroposterior and lateral dimensions of thoracic cavity, resulting in inhalation; relaxation depresses ribs and decreases anteroposterior and lateral dimensions of thoracic cavity, resulting in exhalation.

      2. Innervation: Thoracic spinal nerves T2–T12.

    2. Muscle: Internal intercostals

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

      2. Innervation: Thoracic spinal nerves T2–T12.

References:

  • Tortora, G. J., & Derrickson, B. (2017). Principles of anatomy and physiology (15th ed.). Wiley Custom Learning Solutions.