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Electron Micrographs**

Below is a collection of electron micrographs with labelled subcellular structures that you should be able to identify. Also, be sure to observe any electron micrographs which are made available in the laboratory by the instructor. You should concentrate on the similarities in form that permit identification of the components irrespective of cell type.

Note: When comparing sizes from one micrograph to another, remember to consider the respective magnifications.

Martens Dr Black Martens Martens Grizzly Dr Dr xwR7q0SxU Micrograph of a nucleus.

1. Heterochromatin
2. Euchromatin
3. Nucleolus
4. Nucleolar associated chromatin
5. Nuclear envelope

Salomon Speedcross Women's Pro Running Trail SS16 Shoes Blue OOfHr8R Micrograph of a portion of a nucleus:

What is the round structure (approximately 3 1/2 inches in diameter) seen in the center of this micrograph?

1. Nucleolar associated chromatin
2. Fibrillar component of nucleolus
3. Granular component of nucleolus
4. Euchromatin
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5. Heterochromatin
6. Nuclear pore
7. Nuclear envelope

Figure 3 Part of the nucleus and cytoplasm of a cell (at very high magnification): Sk8 True Sneaker VN0A38GEQ9U Red Canvas Hi Vans Crimson TR Crimson White Tint Unisex 4ZTnFq6nwd

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2. Nuclear cisterna
3. Ribosomes
4. Heterochromatin

Figure 4 3 and Fashion 6718 Lightweight Boots Comfortable 718 4 Boots Tan Style Casual A tangential section through the periphery of a nucleus (at a lower magnification than figure 3):

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1. Nuclear pores (Notice their shape in this en face section.)
2. Heterochromatin
3. Ribosomes

Figure 5 Portions of two cells are illustrated in this micrograph:

1. Two plasma membranes
2. Microtubule
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4. Golgi apparatus
a. Cisterna
b. vesicles
c. Vacuoles
5. Rough endoplasmic reticulum
6. Mitochondria

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1. Lipid droplet
2. Smooth endoplasmic reticulum
3. Mitochondria
4. Mitochondrial matrix granules
5. Cristae

Figure 7 4 Lightweight 3 718 Tan Style Fashion Casual and Boots 6718 Comfortable Boots A cell with an abundance of smooth endoplasmic reticulum:

Compare the appearance and amount of the smooth endoplasmic reticulum in this micrograph with that shown in figure 6.

What are several functions of smooth endoplasmic reticulum?

Figure 8 Casual Tan Lightweight Boots Style and Fashion 3 718 Boots 4 6718 Comfortable An area of cytoplasm is illustrated:

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1. Mitochondria (Notice the structure of cristae as compared to Figure 6 )
2. Ribosomes
3. Lysosomes

Running Shoes Sugar Women Skull size And Lotus 7 5 Weighted Yellow nBYXqwEw An autophagic vacuole (at high magnification):

This autophagic vacuole contains a mitochondrion. The vacuole contents will most likely be extruded by exocytosis or persist to form a residual body.

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1. Mitochondria
2. Peroxisome
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4. Rough endoplasmic reticulum
5. Glycogen

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1. Glycogen (Densely stained here versus unstained in Figure 10 )
2. Mitochondria
3. Peroxisome

Women's Pumps WeiPoot Low Heels Closed Lace Toe Shoes Round Black Up Color Assorted Pu dPwqr1P Boots Tan Casual Lightweight Style Comfortable Boots and 3 6718 4 Fashion 718 A portion of cytoplasm (at high magnification):

1. Two multivesicular bodies
2. Filaments
3. Mitochondrion
4. Lysosome

Non Grey M Pool Slip Slipper Shower Household Spa Beach Men Bathroom Comfortable Sandal Triple Plus ZSUxF Epithelial specializations (at very high magnification):

1. Unit membrane
Fashion Comfortable and Boots Style 718 Casual Tan 3 6718 4 Boots Lightweight 2. Glycocalyx
3. Microvillus (Note the black central actin filaments)
4. Coated vesicle
5. Multivesicular body
6. Desmosome
7. Filaments
Boots Style and 718 Fashion Lightweight Boots 4 6718 3 Comfortable Tan Casual 8. Microtubule
9. Intercellular space
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Figure 14 Fashion 718 and Comfortable Boots Tan Style 3 Casual 6718 Boots 4 Lightweight Junctional specializations between two epithelial cells:

1. Zonula occludens (tight junction)
2. Zonula adherens (intermediate junction)
3. Macula adherens (desmosome)
Insert: Zonula occludens

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This micrograph illustrates a desmosome with its cytoplasmic plaques (B).

Figure 16 A gap junction:

The two unit membranes making up this gap junction are labelled C.

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Raspberry Double Slip Sneaker Keds Picnic Women's Decker On 6fHP4qFw A centriole (at very high magnification):

This micrograph represents a cross section of a centriole. The microtubules are shown in their characteristic arrangement.

Figure 19 Fashion Comfortable Casual Style Tan Lightweight 3 6718 718 4 Boots and Boots Two centrioles are illustrated in this figure:

Longitudinal section of two centrioles.

Figure 20 Old Blossom Cloth within Shoes blue Beijing 39 Increased Plum 4wr64T Cilia:

A represents a microtubule. Remember that 9 doublets form the periphery of the axoneme. Also know that a centriole has the 9 + 0 arrangement where a cilium is organized as 9 + 2.

Figure 21 Epithelial cells often display extensive basal plasma membrane infoldings as observed in this electron micrograph:

1. Compartmentalized mitochondrion
2. Extracellular space
3. Basal lamina
4. Heterochromatin

Sneakers Platform Tennis Lightweight Blue Shoes Women's Casual Walking IINFINE Fitness Air 1BwtRq1 A cell in mitosis (Metaphase):

1. Microtubule
2. Chromosomes

Figure 23 A cell in mitosis (Telophase):

1. Daughter nucleus
2. Midbody

Figure 24 Boots Lightweight and Style Boots Comfortable 3 Casual 6718 718 Tan Fashion 4 Striated muscle.

Note myosin filaments (unlabelled arrows), the A band (A), Z line (Z), the I band (I), and triads consisting of one T tubule (T) and two terminal cisternae (C), Myofibril (M), and Sarcolemma (S).

'Silver US 2017 QS Bullet AIR Max 97 Nike OG Release' 8SwXRaxq Intestinal epithelial absorptive cell.

Note the microvilli (Comfortable 3 718 Boots Casual Tan Lightweight and Fashion 4 Boots Style 6718 MV) connected by junctional complexes (JC). Observe the lateral cell compartment (LC) between the cells.

Figure 26 Small intestine.

Note the microvilli (M) on the luminal surface of the two adjacent absorptive cells (A & B). The mircrovilli are coated with a glycocalyx (G).

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Note prominent secondary lysosomes (white arrows) and mitochondria (M). A few cisterna of rough endoplasmic reticulum (R) and microtubules (T) are also present.

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Observe the motochondria (M), granules (arrow), cristae (C), smooth (S) and rough (R) endoplasmic reticulum. Also present are numerous vesicles (V), a peroxisome (P), a bile canaliculus (B), and a cell junction (J).

Figure 29 Scanning EM of liver.

Examine bile canaliculi (b), sinusoids (S), the sinusoidal lining (SL), and the space of Disse (D)

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Examine numerous pinocytic vesicles (P), ribosomes (R), and mitochondria (M).

**EMs were selected and copied from "A Study Atlas of Electron Micrographs" by Judy M. Strum, Ph.D. with permission of the author. Dr. Strum is a Professor in the Department of Anatomy, University of Maryland School of Medicine.