Muscle Tissue Upcoming events: muscle tissue today muscle tissue NOT on Exam #1 Exam #1 this Thursday Bring a scantron form & a pencil BE ON TIME!

1. Name this structure 2. Name this structure (be specific) 3. Give one function of the structure in #2 (be specific) 4. List at least 6 movements that the shoulder can make 5. List at least 4 movements that the TMJ can make

Muscle Tissue 3 types of muscle tissue basic histology What is a muscle fiber? Connective tissue wrappings types of muscle attachments neuromuscular junction smooth and cardiac muscle

skeletal cardiacsmooth

Muscle fiber = muscle cell

Skeletal muscle fibers are multinucleated Muscle fibers are wrapped with connective tissue

Myoblasts fuse Skeletal muscle fibers: multinucleated striated excitable contract extensible elastic wrapped with CT hypertrophy atrophy

Tendon Deep fascia Epimysium Epi = upon, above Perimysium Peri = around Endomysium Endo = within Connective tissue wrappings of skeletal muscle Myo, mys = muscle

Bellies Insertion Origins Muscle attachments Ligaments: bone to bone Tendons: muscle to bone Direct vs Indirect attachment

Aponeurosis Muscle to skin Muscle to muscle via tendon

Neuromuscular junction

Fig (TE Art) Synaptic vesicles (containing ACh) Motor end plate ACh = acetylcholine

Fig p270a(TE Art) Neuron release ACh Electrical excitation spreads across muscle fiber and down T tubules

Ca 2+ Release Calcium Calcium + ATP = muscle contraction Neurotoxins...

Rigor Mortis What is rigor mortis? Why do the muscles contract after death? Why do they remain contracted for up to 24 hours? Why does rigor mortis only last 24 hours?

Fig b

Fig (TE Art) Muscularis externa Mucosa Circular layer Longitudinal layer Submucosa Epithelium Lamina propria Muscularis mucosae