Ch.9: the muscular system
What is the name for a bundle of muscle fibers?
fascicle
This muscle, which is located between the ribs, depresses the ribs
Internal intercostals
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)
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.
serrates anterior
What prominent feature of the hip would you palpate if you wanted to find the insertion of sartorius?
Anterior superior iliac spine
Chemical communication between a synaptic terminal of the neuron and a skeletal muscle fiber occurs at a site called what?
neuromuscular synapse
Name the muscles of erector spinae from medial to lateral.
Spinalis, Longissimus, Iliocostalis
Mnemonic: I like spaghetti!
What is the most lateral muscle of the hamstrings?
Biceps femoris
Name an antagonist to infraspinatus
Subscapularis, teres major (best answers); also acceptable… latissimus dorsi, pectoralis major, and deltoid
If someone is tense and needs a shoulder rub, which muscle would you massage?
trapezius
What happens to the A band during a muscle contraction?
A stays the same
Frontalis and occipitalis are separated by a collagenous sheet called what?
Galea aponeurotica
Name an antagonist to gastrocnemius
Tibialis anterior
Name 2 muscles that produce flexion at the elbow.
Biceps brachii, brachialis, brachioradialis; also pronator teres
What does ICT stand for?
Inferior carotid triangle
Which types of skeletal muscle fibers are large in diameter, use enormous amounts of ATP, and fatigue rapidly?
Fast (or white) fibers
This muscle has two bellies (one extending from the chin to the hyoid, and the other from the hyoid to the mastoid portion of the temporal bone) – it opens the mouth by depressing the mandible
digastric
Which muscles produce eversion of the foot and plantar flexion at the ankle?
Fibularis longus and brevis (a.k.a. peroneus)
What action do the rhomboids perform?
Adduction and downward rotation of the scapula
The tendons of what two muscles come together to form the calcaneal tendon?
Gastrocnemius and soleus
Calcium ions bind to what during a muscle contraction?
troponin
This muscle begins at the xiphoid process and ends near the pubic symphysis – it is divided longitudinally by a median collagenous partition, the linea alba
Rectus abdominus
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
Muscles of the rotator cuff
Supraspinatus, infraspinatus, teres minor, subscapularis
What does SMT stand for?
Submandibular triangle