Questions and Answers
What is the origin of the epicranius (frontal belly)?
What is the insertion of the epicranius (frontal belly)?
skin of eyebrows and root of nose
What is the action of the epicranius (frontal belly)?
raises eyebrows
What is the origin of the epicranius (occipital belly)?
Signup and view all the answers
What is the insertion of the epicranius (occipital belly)?
Signup and view all the answers
What is the action of the epicranius (occipital belly)?
Signup and view all the answers
What is the origin of the orbicularis oculi?
Signup and view all the answers
What is the insertion of the orbicularis oculi?
Signup and view all the answers
What is the action of the orbicularis oculi?
Signup and view all the answers
What is the origin of the orbicularis oris?
Signup and view all the answers
What is the insertion of the orbicularis oris?
Signup and view all the answers
What is the action of the orbicularis oris?
Signup and view all the answers
What is the origin of the buccinator?
Signup and view all the answers
What is the insertion of the buccinator?
Signup and view all the answers
What is the action of the buccinator?
Signup and view all the answers
What is the origin of the zygomaticus major?
Signup and view all the answers
What is the insertion of the zygomaticus major?
Signup and view all the answers
What is the action of the zygomaticus major?
Signup and view all the answers
What is the origin of the levator labii superioris?
Signup and view all the answers
What is the insertion of the levator labii superioris?
Signup and view all the answers
What is the action of the levator labii superioris?
Signup and view all the answers
What is the origin of the depressor labii inferioris?
Signup and view all the answers
What is the insertion of the depressor labii inferioris?
Signup and view all the answers
What is the action of the depressor labii inferioris?
Signup and view all the answers
What is the origin of the temporalis?
Signup and view all the answers
What is the insertion of the temporalis?
Signup and view all the answers
What is the action of the temporalis?
Signup and view all the answers
What is the origin of the masseter?
Signup and view all the answers
What is the insertion of the masseter?
Signup and view all the answers
What is the action of the masseter?
Signup and view all the answers
What is the origin of the platysma?
Signup and view all the answers
What is the insertion of the platysma?
Signup and view all the answers
What is the action of the platysma?
Signup and view all the answers
What is the origin of the sternocleidomastoid?
Signup and view all the answers
What is the insertion of the sternocleidomastoid?
Signup and view all the answers
What is the action of the sternocleidomastoid?
Signup and view all the answers
What is the origin of the digastric muscle?
Signup and view all the answers
What is the insertion of the digastric muscle?
Signup and view all the answers
What is the action of the digastric muscle?
Signup and view all the answers
What is the origin of the mylohyoid?
Signup and view all the answers
What is the insertion of the mylohyoid?
Signup and view all the answers
What is the action of the mylohyoid?
Signup and view all the answers
What is the origin of the thyrohyoid?
Signup and view all the answers
What is the insertion of the thyrohyoid?
Signup and view all the answers
What is the action of the thyrohyoid?
Signup and view all the answers
What is the origin of the omohyoid?
Signup and view all the answers
What is the insertion of the omohyoid?
Signup and view all the answers
What is the action of the omohyoid?
Signup and view all the answers
What is the origin of the sternohyoid?
Signup and view all the answers
What is the insertion of the sternohyoid?
Signup and view all the answers
What is the action of the sternohyoid?
Signup and view all the answers
Study Notes
Epicranius
-
Frontal Belly Origin: Galea aponeurotica, a broad tendon connecting the front and back of the scalp.
-
Frontal Belly Insertion: Skin of the eyebrows and the root of the nose.
-
Frontal Belly Action: Raises eyebrows, contributing to facial expressions of surprise or curiosity.
-
Occipital Belly Origin: Occipital and temporal bones, located at the back of the skull.
-
Occipital Belly Insertion: Galea aponeurotica, forming a connection with the frontal belly.
-
Occipital Belly Action: Fixes the aponeurosis and pulls the scalp posteriorly, aiding in the movement of the scalp.
Orbicularis Oculi
- Origin: Frontal and maxillary bones surrounding the eye socket.
- Insertion: Tissues of the eyelids, encapsulating the eye.
- Action: Closes the eyes and draws the eyebrows inferiorly, essential for blinking and squinting.
Orbicularis Oris
- Origin: Maxilla and mandible, blending fibers with surrounding muscles.
- Insertion: Muscle and skin at the corners of the mouth, forming the lips.
- Action: Closes lips, often referred to as the "kissing muscle," important for articulation and facial expressions.
Buccinator
- Origin: Molar region of the maxilla and mandible, near the cheek.
- Insertion: Orbicularis oris, integrating with the muscle around the mouth.
- Action: Compresses the cheeks, aiding in chewing and helping to keep food in place during mastication.
Zygomaticus Major
- Origin: Zygomatic bone, located in the cheek.
- Insertion: Skin and muscle at the corners of the mouth, enhancing facial movements.
- Action: Known as the "smiling muscle," elevates the lateral corners of the mouth upward.
Levator Labii Superioris
- Origin: Zygomatic bone and infraorbital margin of the maxilla.
- Insertion: Skin and muscle of the upper lip and the border of the nostril.
- Action: Opens the lips, particularly elevating the upper lip for expressions like disdain or sneering.
Depressor Labii Inferioris
- Origin: Body of the mandible, lateral to its midline.
- Insertion: Skin and muscle of the lower lip.
- Action: Draws the lower lip inferiorly, allowing for expressions of sadness or doubt.
Temporalis
- Origin: Temporal fossa, located on the side of the skull.
- Insertion: Coronoid process of the mandible, where it influences jaw movement.
- Action: Closes the jaw, playing a crucial role in mastication.
Masseter
- Origin: Zygomatic arch and maxilla, forming a strong jaw muscle.
- Insertion: Angle and ramus of the mandible, facilitating powerful movements.
- Action: Prime mover of jaw closure, essential for biting and chewing.
Platysma
- Origin: Fascia of the chest and deltoid muscle.
- Insertion: Lower margin of the mandible and skin/muscle at the corners of the mouth.
- Action: Tenses skin of the neck and assists in facial expressions of horror or surprise.
Sternocleidomastoid
- Origin: Manubrium and medial portion of the clavicle.
- Insertion: Mastoid process and superior nuchal line, allowing neck rotation.
- Action: Flexes the neck forward, also aiding in the rotation of the head.
Digastric
- Origin: Lower margin of the mandible and mastoid process.
- Insertion: Connective tissue to the hyoid bone, crucial for swallowing.
- Action: Opens the mouth and depresses the mandible, facilitating the act of chewing.
Mylohyoid
- Origin: Medial surface of the mandible, forming a muscular floor to the mouth.
- Insertion: Hyoid bone, contributing to the movement of the tongue and floor of the mouth.
- Action: Elevates the hyoid bone and base of the tongue during swallowing.
Thyrohyoid
- Origin: Thyroid cartilage, part of the larynx.
- Insertion: Hyoid bone, providing support to the laryngeal structure.
- Action: Depresses the hyoid bone, involved in speech and swallowing mechanics.
Omohyoid
- Origin: Superior surface of the scapula, influencing neck movement.
- Insertion: Hyoid bone's inferior border, connecting neck structures.
- Action: Depresses larynx and hyoid bone, important for swallowing and speech.
Sternohyoid
- Origin: Manubrium and medial end of the clavicle, foundational for neck muscles.
- Insertion: Lower margin of body of the hyoid bone, linking the hyoid to the sternum.
- Action: Depresses the larynx and hyoid bone, assisting in phonation and swallowing.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Explore the origins, insertions, and actions of major muscles in the body through flashcards. This quiz focuses on the epicranius muscle, detailing its anatomical features and functions. It's a great way to reinforce your understanding of muscle anatomy and their roles in movement.