250 LABORATORY MANUAL OF HUMAN ANATOMY 



(baa) Medial palpebral ligament (ligamentum palpe- 



brale mediale). 



(bab) Lateral palpebral raphe (raphe palpebralis lat- 



(bb) Orbital part (pars orbitalis). 

 (be) Lacrimal part (pars lacrimalis [Horneri]). 

 (c) Corrugator muscle (M. corrugator). 



Note the relation of the muscle to physical or mental effort. 



Muscles of the nose. 

 Dilators. 



(a) Transverse part of nasal muscle (pars transversa M. nasalis). 



Note the origin on the back of the nose and insertion into 

 skin of nasolabial groove not jugulum alveolare of upper 

 canine tooth. It is called the " muscle of sensuality." 



(b) Dilator muscle of nose (M. dilator naris). 



(c) Angular head of quadrate muscle of upper lip (caput angular e 



M. quadrati labii superioris) (0. T. superficial elevator of lip). 



(d) Infraorbital head of quadrate muscle of upper lip (caput infra- 



orbit. M. quadrat, labii superioris) (0. T. deep elevator of 

 upper lip). 

 Constrictors. 



(a) Alar part of nasal muscle (pars alaris M. nasalis) (0. T. de- 



pressor alae nasi). 



(b) Depressor muscle of septum (M. depressor septi). 



(c) Triangular muscle of nose (M. triangularis nasi). 



Muscles of the lips. 

 Dilators of mouth. 

 Group 1. 



(a) Muscle of laughing (M. risorius). 



(b) Zygomatic muscle (M. zygomaticus) (muscle of grimace). 

 Group 2. 



(c) Quadrate muscle of upper lip (M. quadratus labii superioris). 



(ca) Zygomatic head (caput zygomaticum) (0. T. zygomati- 



cus minor). 



(cb) Infraorbital head (caput infraorbitale) (0. T. levator 



labii superioris). 



(cc) Angular head (caput angular e) (0. T. superficial ele- 



vator of lip, or levator labii superioris alaeque nasi). 

 Group 3. 



(d) Canine muscle (M. caninus) (muscle of menacing hate) (0. 



T. levator anguli oris). 



(e) Triangular muscle of mouth (M. triangularis oris) (muscle of 



sadness) (0. T. depressor anguli oris). 

 Group 4. 



(/) Quadrate muscle of lower lip (M. quadratus labii inferioris) 



(0. T. depressor labii inferioris). 



(g) Chin muscle (M. mentalis) (muscle of hesitation, doubt, dis- 

 dain, disgust). 

 Group 5. 



(h) Cheek muscle (M. buccinator) (muscle of suckling; trumpet- 

 blower's or glass-blower's muscle). 



