Zool 325 Lab: Deep Muscle Functions

What is the function of the rectus abdominus?

It pulls the sternum and ribs caudally; causing flexion of the trunk

What is the function of the serratus ventralis?

It draws the scapula towards the thoracic wall; it stabilizes it

What is the function of the transverse costarum?

It pulls the ribs cranially

What is the function of the subscalpularis and the Coracobrachialis?

It adducts the humerus

What is the function of the scalenes?

They bend the neck and pull the ribs cranially

What is the function of the external oblique, internal oblique and transverse abdominis?

Compresses the abdominal region

What is the function of the intercostalis externus?

Protracts the ribs

What is the function of the Intercostalis internus?

Retracts the ribs

What is the function of the Epitrochlearis and Triceps?

Extends the forearm

What is the function of the Biceps brachii and the brachialis?

It flexes the forearm

What is the function of the serratus dorsalis?

The anterior portion draws the ribs cranially

The posterior portion draws the ribs caudally

What is the function of the Teres major ?

It retracts the humerus and rotates it medially

What is the function of the Teres minor and infraspinous?

Rotates the humerus laterally

What is the function of the Rhomboidius?

It adducts the scalpula

What is the function of the Rhombodius Capitus?

It rotates and pulls the scapula cranially

What is the function of the Supraspinous?

It protracts the humerus

What is the function of the Splenius?

The left and right together elevate and extend the head

Individually the flex the head laterally

What is the function of the Mufidus spine?

Bilateral action extends the vertebral column

Unilateral action bends the vertebral column laterally

What is the function of the Longissimus dorsi?

It extends the vertebral column

What is the function of the Triceps brachii, the Epitrochlearis and the Aconeus?

Extends the forearm

What is the function of the Sternomastoid?

Bilateral action flexes the head

Unilateral action turns the head

What is the function of the Sternohyoid?

Retracts the hyoid

What is the function of the Mylohyoid?

Elevates the floor of the mouth

What is the function of the Digastric?

Depresses the floor of the mandible

What is the function of the Masseter?

Elevates the mandible

What is the function of the Sternothyroid?

Retracts the larynx

What is the function of the Cricothyroid?

Tenses the vocal chords

What is the function of the paratid and mandibular glands?

Produce saliva for lubrication, transportation and digestion of food

What is the function of the Hypaxial musculature?

Flexion of the trunk and caudal region

What is the function of the epaxial + hypaxial musculature?

Flexion of the trunk and caudal region

What is the function of the Pectoral fin abductor vs adductor?

Pectoral fin abductor: Pulls the fin away from the midline

Pectoral fin adductor: Pulls the fin towards the midline

What is the function of the cucularis in sharks?

Elevates the scapular process

What is the function of the dorsal superficial constrictors, the second dorsal constrictor and ventral superficial constritcor in sharks?

They compress the gill pouches

What is the function of the Adductor mandibulae in sharks?

Elevates the Meckels cartilage

What is the function of the Spiracularis and the Levator Palatoquadri in sharks?

They elevate the palotoquadrate

What is the function of the Coracoarcuals, Coracomandibular, Coracobrachials and Coracohyoid in sharks?

Depressing the lower jaw

What is the function of the Intermandibularis in sharks?

Elevates the floor of the mouth (sharks)