Lab Exam 2: Origins/Insertions Flashcards
Ligament attachment of hyoid bone
- Stylohyoid ligamnet
- Thyrohyoid membrane
Platysma Innervation
- Facial nerve (CN VII)
Platysma Function
- Depress mandible
- Facial expression
Platysma Attachment
- Deep fascia upper chest
- Mandible
Sternocleidomastoid (SCM) Origins
- Sternal: manubrium
- Clavicular: medial 1/3 of clavicle
SCM Insertion
- Mastoid process
- Superior nuchal line
SCM Innervation
- Spinal accessory nerve (CN XI)
Posterior Triangle Boundaries
- A: posterior border of SCM
- P: anterior border of trapezius
- I: middle 1/3 of clavicle
- S: Jxn of trap and SCM
- R: overlying fascia
- F: scalenes, splenius capitis, levator scapulae
Anterior Triangle Boundaries
- A: midline of neck
- P: anterior border of SCM
- I: jugular notch
- S: inferior border of mandible
- R: overlying fascia
- F: pharynx, larynx, thyroid gland
Tributaries of EJV
- Anterior jugular
- Cervicodorsal
- Suprascapular veins
Cervical Plexus Location
- Posterior border of SCM while it’s laid flat
Anterior Cervical Muscles Funtcion
- Stabilize/move hyoid bone and larynx
Suprahyoid Muscles
- Connect the hyoid bone and cranium
- Elevate the hyoid (swallowing)
Mylohyoid Attachments
- Mylohyoid line
- Body of hyoid
Mylohyoid Innervation
- Nerve to mylohyoid (CN V, mandibular division of trigeminal)
Mylohyoid Function
- Elevate hyoid
- Elevate floor of mouth
Geniohyoid Attachments
- Inferior mental spine of mandible
- Body of hyoid
Geniohyoid Innervation
- C1 fibers traveling with hypoglossal nerve
Geniohyoid Function
- Pulls hyoid anterosuperiorly
Stylohyoid Attachments
- Styloid process of temporal bone
- Body of hyoid
Stylohyoid Innervation
- Facial nerve (CN VII)
Stylohyoid Function
- Elevates and retracts hyoid
Anterior Belly of Digastric Attachments
- Digastric fossa
- Hyoid bone
Anterior Belly of Digastric Innervation
- Nerve to myohyloid (CN V, mandibular division of trigeminal)
Posterior Belly of Digastric Attachments
- Mastoid notch of temporal bone
- Hyoid body
- Greater horn of hyoid
Posterior Belly of Digastric Innervation
- Facial nerve (CN VII)
Digastric Muscles Function
- Depress mandible
- Elevate hyoid
- Joined by intermediate tendon
Infrahyoid Muscles (TOSS)
- Thylohyoid
- Omohyoid
- Sternohyoid
- Sternothyroid
Infrahyoid Muscles Innervation (all except thyrohyoid)
- Ansa cervicalis
Infrahyoid Muscles Function
- Depress the hyoid and larynx
Sternohyoid Attachments
- Manubrium/medial end of clavicle
- Hyoid body
Omohyoid Attachments
- Superior border of scapula
- Hyoid body
- 2 bellies connected by an intermediate tendon
Sternothyroid Attachments
- Manubrium
- Oblique line of thyroid cartilage
Thyrohyoid Attachments
- Oblique line of thyroid cartilage
- Inferior border of hyoid
- Greater horn of hyoid
Thyrohyoid Innervation
- C1 branches traveling with hypoglossal nerve
Submental Triangle Boundaries
- I: body of hyoid
- L: anterior bellies of digastric muscle
- Apex: mandibular symphysis
- Floor: mylohyoid muscles
Submandibular Triangle Boundaries
- S: inferior border of mandible
- A: anterior belly of digastric
- P: posterior belly of digastric
- F: mylohyoid, hypoglossus
Muscular Triangle Boundaries
- P/I: anterior border of SCM
- P/S: superior belly of omohyoid
- M: midline of neck (hyoid bone to jugular notch)
Carotid Triangle Boundaries
- I/M: superior belly of omohyoid
- S: posterior belly of digastric
- P: anterior border of SCM
Tributaries of IJV
- Sigmoid sinus
- Inferior potrosal sinus
- Common facial vein
- Superior and middle thyroid vein
Hyoid Bone Vertebral Level
- C3
Thyroid Cartilage Vertebral Level
- C4-6
Cricoid Cartilage Vertebral Level
- C6
Thyroid Gland Vertebral Level
- C5-T1
Anterior Scalene Attachments
- TP of C3-6
- 1st rib, anterior to subclavian artery groove
Middle Scalene Atachments
- TP of C2-7
- 1st rib, posterior to subclavian groove
Posterior Scalene Attachments
- TP of C4-6
- 2nd rib
Scalenus Minimus Attachments
- TP of C7
- 1st rib or suprapleural membrane
Pectoralis Major Proximal Attachment
- Medial 1/3 of clavicle
- Anterior sternum
- Upper 6 costal cartilages
- Aponeurosis of external oblique
Pectoralis Major Distal Attachment
- Lateral lip of intertubervular sulcus
Pectoralis Major Innervation
- Lateral pectoral nerve (C5-7)
- Medial pectoral nerve (C8-T1)
Pectoralis Major Function
- Adduction
- Medial rotation
- Flexion
Pectoralis Minor Proximal Attachment
- Ribs 3-5
Pectoralis Minor Distal Attachment
- Coracoid process
Pectoralis Minor Innervation
- Medial pectoral nerve (C8-T1)
Pectoralis Minor Function
- Stabilize scapula
- Pulls against thoracic wall
- Accessory muscle of innervation
Subclavius Proximal Attachment
- 1st rib/costal cartilage junction
Subclavius Distal Attachment
- Inferior and middle 1/3 of clavicle
Subclavius Innervation
- Nerve to subclavius (C5)
Subclavius Function
- Stabilize SC joint
- Depress clavicle
Levator Scapulae Proximal Attachment
- Posterior tubercles of C1-4 TPs
Levator Scapulae Distal Attachment
- Medial border of scapula (above scapular spine base)
Levator Scapulae Innervation
- Dorsal scapular nerve (C4,5) motor
- C3,4 proprioception
Levator Scapulae Funtcion
- Elevates and rotates scapula
- Glenoid fossa rotates inferiorly
Rhomboid Minor Proximal Attachment
- Nuchal ligament
- C7 and T1 SPs
Rhomboid Major Proximal Attachment
- T2-5 SPs
Rhomboid Minor Distal Attachment
- Base of scapular spine
Rhomboid Major Distal Attachment
- Spine to inferior angle of scapula
Rhomboids Innervation
- Dorsal scapular nerve (C4,5)
- C3,4 proprioception
Rhomboids Function
- Retract and rotate scapula
- Fix scapula against thoracic wall
