N3 (1st Sem AY 2022-2023): AYUYAO, Louisse Julianna P_Activity 2

ACTIVITY 2

AYUYAO, Louisse Julianna P_Activity 2

ACTIVITY	MUSCLE	ACTION	INNERVATION
1. Turning a door knob	Supinator	Supinates forearm at radioulnar joints	Deep radial nerve
	Pronator quadratus	Pronates forearm at radioulnar joints	Median nerve
	Pronator teres	Pronates forearm at radioulnar joints and weakly flexes forearm at elbow joint	Median nerve
2. Throwing a baseball overhead	Supraspinatus	Assists deltoid muscle in abducting arm at shoulder joint	Suprascapular nerve
	Deltoid	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	Axillary nerve
	Latissimus Dorsi	Extends, adducts, and medially rotates arm at shoulder joint; draws arm inferiorly and posteriorly. RMA: Elevates vertebral column and torso	Thoracodorsal nerve
3. Kicking a ball	Rectus femoris	Extend leg at knee joint; flexes thigh at hip joint	Femoral nerve
	Iliopsoas	Psoas major and iliacus muscles acting together flex thigh at hip joint, rotate thigh laterally, and flex trunk on hip as in sitting up from supine position	Lumbar spinal nerves L2–L3
	Gluteus maximus	Extends thigh at hip joint and laterally rotates thigh; helps lock knee in extension	Inferior gluteal nerve
4. Doing sit-ups	Rectus abdominis	Flexes vertebral column, especially lumbar portion, and compresses abdomen to aid in defecation, urination, forced exhalation, and childbirth	Thoracic spinal nerves T7–T12
	Transverse abdominis	Compresses abdomen	Thoracic spinal nerves T8–T12, iliohypogastric nerve, and ilioinguinal nerve
	External oblique	Acting together (bilaterally), compress abdomen and flex vertebral column; acting singly (unilaterally), laterally flex vertebral column, especially lumbar portion, and rotate vertebral column	Thoracic spinal nerves T7–T12 and the iliohypogastric nerve
5. Walking	Soleus	Plantar flexes foot at ankle joint	Tibial nerve
	Gluteus minimus	Abducts thigh at hip joint and medially rotates thigh	Superior gluteal nerve
	Tibialis anterior	Dorsiflexes foot at ankle joint and inverts (supinates) foot at intertarsal joints	Deep fibular (peroneal) nerve
6. Breathing	Diaphragm	Contraction of diaphragm causes it to flatten and increases vertical dimension of thoracic cavity, resulting in inhalation; relaxation of diaphragm causes it to move superiorly and decreases vertical dimension of thoracic cavity, resulting in exhalation	Phrenic nerve, which contains axons from cervical spinal nerves (C3–C5)
	External intercostals	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	Thoracic spinal nerves T2–T12
	Internal intercostals	Contraction draws adjacent ribs together to further decrease anteroposterior and lateral dimensions of thoracic cavity during forced exhalation	Thoracic spinal nerves T2–T12

Tortora, G. J., & Derrickson, B. H. (2018). Principles of anatomy and physiology. John Wiley & Sons