The Muscular System (Ch. 9)
Q. What is the name for a bundle of muscle fibers?
Fascicle
Q. This muscle, which is located between the ribs, depresses the ribs
Internal intercostals
Q. This muscle originates anteriorly on ribs 1-8 and inserts on the anterior surface of the vertebral border of the scapula. It protracts the shoulder.
Serratus anterior
Q. Which two muscles are the powerful flexors of the hip that pass deep to the inguinal ligament?
Psoas major and iliacus (a.k.a. iliopsoas)
Q. What prominent feature of the hip would you palpate if you wanted to find the insertion of sartorius?
Anterior superior iliac spine
Q. Chemical communication between a synaptic terminal of the neuron and a skeletal muscle fiber occurs at a site called what?
Neuromuscular synapse (a.k.a. myoneural junction or neuromuscular junction)
Q. Name the muscles of erector spinae from medial to lateral
Spinalis, Longissimus, Iliocostalis
Q. Name an antagonist to infraspinatus
Subscapularis, teres major (best answers); also acceptable… latissimus dorsi, pectoralis major, and deltoid
Q. What is the most lateral muscle of the hamstrings?
Biceps femoris
Q. If someone is tense and needs a shoulder rub, which muscle would you massage?
Trapezius
Q. What happens to the A band during a muscle contraction?
The width remains constant
Q. Frontalis and occipitalis are separated by a collagenous sheet called what?
Galea aponeurotica (a.k.a epicranial aponeurosis)
Q. Name 2 muscles that produce flexion at the elbow.
Biceps brachii, brachialis, brachioradialis; also pronator teres
Q. Name an antagonist to gastrocnemius
Tibialis anterior
Q. Name the transverse bands of fibrous tissue that cause a fit person to have what we call a six pack.
Tendinous inscriptions of the rectus abdominis muscle
Q. Which types of skeletal muscle fibers are large in diameter, use enormous amounts of ATP, and fatigue rapidly?
Fast (or white) fibers
Q. This muscle, which has two bellies, depresses the hyoid bone and larynx.
Omohyoid
Q. What action do the rhomboids perform?
Adduction and downward rotation of the scapula
Q. Which muscles produce eversion of the foot and plantar flexion at the ankle?
Fibularis longus and brevis (a.k.a. peroneus)
Q. The tendons of what two muscles come together to form the calcaneal tendon?
Gastrocnemius and soleus
Q. Calcium ions bind to what during a muscle contraction?
Troponin
Q. The inguinal ligament is the aponeurosis of which muscle?
External oblique
Q. Which muscle of the forearm allows you to play the piano?
Flexor digitorum profundus
Q. If an athlete has experienced a pulled groin, which muscle may have been torn?
Pectineus* (the groin muscle), adductor magnus, adductor brevis, adductor longus, or gracilis
Q. If you are feeling for swollen submandibular lymph nodes, which division of the anterior cervical triangle are you palpating?
SHT (Suprahyoid triangle)